{"id":63221,"date":"2026-05-09T05:41:07","date_gmt":"2026-05-08T20:41:07","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=63221"},"modified":"2026-05-09T05:41:07","modified_gmt":"2026-05-08T20:41:07","slug":"lunch-box-lid-to-keychain-the-toaster-science-of-shrink-plastic","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=63221&lang=en","title":{"rendered":"Lunch Box Lid to Keychain?! The Toaster Science of Shrink Plastic!"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>This is Kuwako Lab, your science trainer. Every day is an experiment.<\/strong><\/span><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35704\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/3579c0c1b9e85748697f0e237b55c42f.jpg\" alt=\"\" width=\"327\" height=\"371\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/3579c0c1b9e85748697f0e237b55c42f.jpg 724w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/3579c0c1b9e85748697f0e237b55c42f-264x300.jpg 264w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/p>\n<p>What if I told you that an ordinary bento box lid could transform into an adorable keychain? All you need is a toaster oven and the plastic lid itself. Sounds impossible, right? But behind this simple craft lies some surprisingly fascinating plastic science.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u307f\u308b\u307f\u308b\u5909\u5f62\uff01\u304a\u5f01\u5f53\u306e\u30d1\u30c3\u30af\u3092\u30c8\u30fc\u30b9\u30bf\u30fc\u306b\u30a4\u30f3\u3010\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u306e\u79d1\u5b66\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/YCHLhVX0Pd8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>So, What Exactly Is Plastic?<\/h3>\n<p>Plastic is a type of synthetic resin \u2014 a material made from man-made polymers derived mainly from petroleum. The word \u201cpolymer\u201d refers to giant molecules formed when countless smaller molecules link together, almost like hundreds of LEGO bricks snapped into a long chain.<\/p>\n<p>There are many kinds of plastics used in everyday life. Here are some common examples often introduced in Japanese middle school science classes.<\/p>\n<p><b>PE (Polyethylene) \u2014 Burns Easily \u2014 Garbage Bags<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35317 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/0d78805bce7939f7ddfab39d678ece5f.jpg\" alt=\"\" width=\"351\" height=\"337\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/0d78805bce7939f7ddfab39d678ece5f.jpg 990w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/0d78805bce7939f7ddfab39d678ece5f-300x288.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/0d78805bce7939f7ddfab39d678ece5f-768x739.jpg 768w\" sizes=\"auto, (max-width: 351px) 100vw, 351px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35318 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/1edf75e91b254a02dd0e1bda2ea407c7.jpg\" alt=\"\" width=\"432\" height=\"239\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/1edf75e91b254a02dd0e1bda2ea407c7.jpg 794w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/1edf75e91b254a02dd0e1bda2ea407c7-300x166.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/1edf75e91b254a02dd0e1bda2ea407c7-768x426.jpg 768w\" sizes=\"auto, (max-width: 432px) 100vw, 432px\" \/><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35319 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6b6d2b819d99507ba00796df21aaec46.jpg\" alt=\"\" width=\"506\" height=\"256\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6b6d2b819d99507ba00796df21aaec46.jpg 1136w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6b6d2b819d99507ba00796df21aaec46-300x152.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6b6d2b819d99507ba00796df21aaec46-1024x517.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6b6d2b819d99507ba00796df21aaec46-768x388.jpg 768w\" sizes=\"auto, (max-width: 506px) 100vw, 506px\" \/><\/p>\n<p><b>PP (Polypropylene) \u2014 Burns Easily \u2014 Bottle Caps<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35323 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6cd055c36c100ec7ae0c84a45c86aee6.jpg\" alt=\"\" width=\"312\" height=\"285\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6cd055c36c100ec7ae0c84a45c86aee6.jpg 692w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/6cd055c36c100ec7ae0c84a45c86aee6-300x274.jpg 300w\" sizes=\"auto, (max-width: 312px) 100vw, 312px\" \/><\/p>\n<p><b>PET (Polyethylene Terephthalate) \u2014 Harder to Burn \u2014 Plastic Bottles<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35316 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/658e4e9e5a51fd87142b9d47b2020fdf.jpg\" alt=\"\" width=\"200\" height=\"406\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/658e4e9e5a51fd87142b9d47b2020fdf.jpg 348w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/658e4e9e5a51fd87142b9d47b2020fdf-148x300.jpg 148w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/p>\n<p style=\"text-align: center;\">Note: The bottle label is polystyrene, while the cap is polypropylene.<\/p>\n<p><b>PS (Polystyrene) \u2014 Burns Easily \u2014 Natto Containers &amp; Bento Lids<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35320 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/aa2c278eff3b91709352dca350c209c3.jpg\" alt=\"\" width=\"385\" height=\"372\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/aa2c278eff3b91709352dca350c209c3.jpg 816w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/aa2c278eff3b91709352dca350c209c3-300x290.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/aa2c278eff3b91709352dca350c209c3-768x742.jpg 768w\" sizes=\"auto, (max-width: 385px) 100vw, 385px\" \/><\/p>\n<p><b>PVC (Polyvinyl Chloride) \u2014 Harder to Burn \u2014 Erasers &amp; Water Pipes<\/b><\/p>\n<h3>What Does \u201cPoly\u201d Mean?<\/h3>\n<p>Have you noticed how many plastic names start with \u201cpoly\u201d? The prefix comes from Greek and means \u201cmany.\u201d So \u201cpolyethylene\u201d literally means \u201cmany ethylene units linked together.\u201d<\/p>\n<p>It\u2019s the perfect name for materials made from thousands upon thousands of connected molecules. You\u2019ve probably seen \u201cpoly\u201d in other words too, like polygon (\u201cmany angles\u201d) or polyphenol (\u201cmany phenol groups\u201d).<\/p>\n<h3>Why Plastics Became Essential to Modern Life<\/h3>\n<p>Plastics spread rapidly throughout the 20th century because they have so many useful properties:<\/p>\n<p>\u30fb<b>Easy to shape and mold<\/b> \u2014 Most soften when heated and harden when cooled<br \/>\n\u30fb<b>Lightweight<\/b><br \/>\n\u30fb<b>Resistant to rust<\/b><br \/>\n\u30fb<b>Slow to decay<\/b><br \/>\n\u30fb<b>Poor conductors of electricity<\/b><br \/>\n\u30fb<b>Durable against impact<\/b><br \/>\n\u30fb<b>Chemically stable and resistant to change<\/b><\/p>\n<p>These advantages made plastics incredibly convenient. At the same time, their resistance to decomposition is also what causes environmental problems such as ocean plastic pollution. Today, scientists are developing biodegradable plastics to solve these issues. In other words, the very properties that make plastics useful are also at the heart of modern environmental challenges.<\/p>\n<h3>The Curious Properties of Polystyrene (PS)<\/h3>\n<p>The star of today\u2019s experiment is <b>polystyrene (PS)<\/b>.<\/p>\n<p>One fascinating feature of polystyrene is that it softens when heated, making it easy to reshape. You can find it in everyday items like bento box lids and shrink plastic sheets (\u201cShrinky Dinks\u201d).<\/p>\n<p>Shrink plastic sheets are still sold at many 100-yen shops today. <a href=\"https:\/\/amzn.to\/4d6nsGo\">When I was a kid, I used to buy them at hobby stores and make all kinds of creations.<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-63178 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32.jpeg\" alt=\"\" width=\"553\" height=\"193\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32.jpeg 1652w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32-300x105.jpeg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32-1024x357.jpeg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32-768x268.jpeg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-08-4.17.32-1536x536.jpeg 1536w\" sizes=\"auto, (max-width: 553px) 100vw, 553px\" \/><\/p>\n<p>Craft shrink plastic is made by stretching thin sheets of polystyrene during manufacturing. When heated, the molecules try to return to their original arrangement, causing the sheet to shrink. Scientifically speaking, it\u2019s more accurate to say the plastic is \u201creturning to its original size\u201d rather than simply \u201cshrinking.\u201d<\/p>\n<p>Using this property, you can create custom keychains at home. It\u2019s simple enough for young children to enjoy, and it\u2019s a fantastic blend of art and science.<\/p>\n<h3>The Science Recipe<\/h3>\n<p><b>Materials:<\/b><br \/>\nToaster oven, polystyrene bento lid, aluminum foil (or parchment paper), two wooden boards<\/p>\n<p><b>Instructions:<\/b><\/p>\n<p><b>1. Draw a picture on the polystyrene lid and heat it in the toaster oven.<\/b><\/p>\n<p>I used a plastic container lid originally designed for rice balls.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-24263 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/174bdd3851e68aca28290036fa4ab7c8.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.48.25\" width=\"362\" height=\"339\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/174bdd3851e68aca28290036fa4ab7c8.jpg 362w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/174bdd3851e68aca28290036fa4ab7c8-300x281.jpg 300w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-24264 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/51cebad51e06041b248bcb843a4d593b.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.48.34\" width=\"572\" height=\"424\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/51cebad51e06041b248bcb843a4d593b.jpg 572w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/51cebad51e06041b248bcb843a4d593b-300x222.jpg 300w\" sizes=\"auto, (max-width: 572px) 100vw, 572px\" \/><\/p>\n<p style=\"text-align: center;\"><b>Be sure to use plastic marked \u201cPS.\u201d<\/b><\/p>\n<p>Before placing it into the toaster oven, crumple a sheet of aluminum foil once and then flatten it slightly. Put the plastic on top. In a workshop by science educator Eiji Komori, I also learned that <b>parchment paper works very well<\/b>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-23970 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/f113a47bb2350ebd46b43f96a7d58d3f.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-01-24 9.46.38\" width=\"387\" height=\"317\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/f113a47bb2350ebd46b43f96a7d58d3f.png 709w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/f113a47bb2350ebd46b43f96a7d58d3f-300x246.png 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/p>\n<p><b>2. As the plastic heats up, it will curl and shrink dramatically.<\/b><\/p>\n<p>Once the shrinking slows down, carefully remove it using chopsticks.<\/p>\n<p>With parchment paper, the plastic peeled off very easily because it didn\u2019t stick much. However, the paper can scorch after repeated use, so aluminum foil may be better for classrooms or large groups.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24268 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/80ce94415876ab1ce8adc075258a326d.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.50.15\" width=\"529\" height=\"296\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/80ce94415876ab1ce8adc075258a326d.jpg 835w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/80ce94415876ab1ce8adc075258a326d-300x168.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/80ce94415876ab1ce8adc075258a326d-768x430.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/80ce94415876ab1ce8adc075258a326d-320x180.jpg 320w\" sizes=\"auto, (max-width: 529px) 100vw, 529px\" \/><\/p>\n<p style=\"text-align: center;\">Into the toaster it goes&#8230;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24257 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/cc62e7e121e817e69d53bc411f3df1f7.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.50.29\" width=\"529\" height=\"315\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/cc62e7e121e817e69d53bc411f3df1f7.jpg 685w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/cc62e7e121e817e69d53bc411f3df1f7-300x179.jpg 300w\" sizes=\"auto, (max-width: 529px) 100vw, 529px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24258 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/422635c61db032c4824d26144f78c9ff.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.50.34\" width=\"533\" height=\"315\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/422635c61db032c4824d26144f78c9ff.jpg 693w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/422635c61db032c4824d26144f78c9ff-300x177.jpg 300w\" sizes=\"auto, (max-width: 533px) 100vw, 533px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24259 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/21a151c5f3d36cef77477af5603d1e11.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.50.41\" width=\"535\" height=\"334\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/21a151c5f3d36cef77477af5603d1e11.jpg 652w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/21a151c5f3d36cef77477af5603d1e11-300x187.jpg 300w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24260 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/76fb682854ba24f4bcdfc25b4911890b.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.50.48\" width=\"541\" height=\"336\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/76fb682854ba24f4bcdfc25b4911890b.jpg 656w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/76fb682854ba24f4bcdfc25b4911890b-300x187.jpg 300w\" sizes=\"auto, (max-width: 541px) 100vw, 541px\" \/><\/p>\n<p style=\"text-align: center;\">And just like that, it becomes a smooth little plastic charm!<\/p>\n<p><b>3. While the plastic is still hot, quickly sandwich it between two wooden boards to flatten it.<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-23968 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/a59713cf90c1390c8bddb91f7e7e8e76.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-01-24 9.46.46\" width=\"365\" height=\"304\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/a59713cf90c1390c8bddb91f7e7e8e76.png 561w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/01\/a59713cf90c1390c8bddb91f7e7e8e76-300x250.png 300w\" sizes=\"auto, (max-width: 365px) 100vw, 365px\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-24262 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/5247fe1631e7f6b7b020315f80779ab0.jpg\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2016-02-20 22.48.17\" width=\"350\" height=\"340\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/5247fe1631e7f6b7b020315f80779ab0.jpg 625w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2016\/02\/5247fe1631e7f6b7b020315f80779ab0-300x292.jpg 300w\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" \/><\/p>\n<p>You\u2019ll notice the polystyrene has become much smaller as it returned to its original state. And there you have it \u2014 your homemade keychain! It\u2019s pretty amazing that something as ordinary as a lunchbox lid can turn into a fun science craft. Add a string or chain, and you\u2019ve got a custom strap ready to use! (^o^)<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35705\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/69951296b11caa484208330661c3ad16.jpg\" alt=\"\" width=\"449\" height=\"195\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/69951296b11caa484208330661c3ad16.jpg 1008w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/69951296b11caa484208330661c3ad16-300x130.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/69951296b11caa484208330661c3ad16-768x334.jpg 768w\" sizes=\"auto, (max-width: 449px) 100vw, 449px\" \/><\/p>\n<h3>After the Experiment, Ask Yourself: Why Did It Shrink?<\/h3>\n<p>The reason shrink plastic contracts is because the polystyrene molecules were stretched during manufacturing. Heating gives those molecules enough energy to move freely again, allowing the material to relax back toward its original shape.<\/p>\n<p>This phenomenon is somewhat similar to <b>shape memory materials<\/b>, which are widely used in modern engineering and manufacturing today.<\/p>\n<p>When you realize that a simple bento lid works using the same scientific principles found in advanced technology, everyday objects suddenly become a lot more interesting. Give it a try at home and experience the science for yourself!<\/p>\n<h3>Contact &amp; More Science Fun<\/h3>\n<p>Want to explore more fun and surprising science experiments you can try at home? This site is packed with easy-to-understand science activities and ideas for curious minds of all ages.<\/p>\n<p>\u30fbThe \u201cScience Idea Notebook\u201d series has been published as a book. Learn more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a><br \/>\n\u30fbAbout Kuwako Lab <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a><br \/>\n\u30fbFor requests such as writing, lectures, workshops, TV supervision, and appearances, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a><br \/>\n<span class=\"s2\">\u30fbFollow updates on <a href=\"https:\/\/x.com\/kuwako\">X<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Idea Channel<\/a> features experiment videos too!<\/p>\n<h3>\uff15\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p>\u30ad\u30fc\u30f3\u3068\u51b7\u3048\u308b\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\uff01\u6c17\u6e29\u304c\u4e0a\u304c\u3063\u3066\u304f\u308b\u3053\u306e\u6642\u671f\u30fb\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u3092\u4f7f\u3063\u305f\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\u306e\u5b9f\u9a13\u306f\u3044\u304b\u304c\uff1f<\/p>\r\n<p><img class=\"alignnone wp-image-39516 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg 1406w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-300x168.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-1024x572.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-768x429.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-320x180.jpg 320w\" alt=\"\" width=\"453\" height=\"253\" \/><\/p>\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=39513\">\u6db2\u4f53\u30bc\u30ed\uff01\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u304c\u6d88\u3048\u308b\u307e\u3067\u306e\uff13\u6642\u9593\u3092\u79d1\u5b66\u3059\u308b\uff08\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\uff09<\/a><\/p>\r\n<h3 style=\"text-align: left;\"><span style=\"font-size: medium;\"><b><strong>\u30c6\u30ec\u30d3\u756a\u7d44\u76e3\u4fee\u30fb\u30a4\u30d9\u30f3\u30c8\u7b49\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/span><\/h3>\r\n<ul>\r\n<li>4\u670830\u65e5\uff08\u6728\uff09\u300cTHE\u7a81\u7834\u30d5\u30a1\u30a4\u30eb\u300d\uff08\u65e5\u672c\u30c6\u30ec\u30d3\uff09\u306e<a href=\"https:\/\/phys-edu.net\/wp\/?p=62906\">\u79d1\u5b66\u76e3\u4fee\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f<\/a>\u3002<\/li>\r\n<li>5\u67088\u65e5\uff08\u91d1\uff09<a href=\"https:\/\/phys-edu.net\/wp\/?p=62629\">\u7406\u79d1\u6559\u80b2\u30cb\u30e5\u30fc\u30b9<\/a>\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li>6\u670814\u65e5\uff08\u65e5\uff09\u3000\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n<li>6\u670826\u65e5\uff08\u91d1\uff09\u3000\u5343\u8449\u5927\u5b66\u306e\u516c\u958b\u7814\u7a76\u4f1a\uff08\u4e2d\u5b66\u7406\u79d1\u306b\u3064\u3044\u3066\u6388\u696d\u516c\u958b\u4e88\u5b9a\uff09<\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 300w\" alt=\"\" width=\"184\" height=\"165\" \/><\/li>\r\n<\/ul>\r\n<h3><span style=\"text-align: center;\">\u5404\u7a2eSNS\uff08\u66f4\u65b0\u60c5\u5831\u3092\u304a\u5c4a\u3051\uff01\uff09<\/span><\/h3>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/twitter.com\/kuwako\">X(Twitter)<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.instagram.com\/science_seeds\/\">instagram<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.facebook.com\/kuwakolab\/\">Facebook<\/a>\uff08\u65e5\u672c\u8a9e\uff09<\/p>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/bsky.app\/profile\/kagakunoneta.bsky.social\">BlueSky<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.threads.net\/@science_seeds?hl=ja\">Threads<\/a>\uff08\u82f1\u8a9e\uff09<\/p>\r\n<h3 style=\"text-align: center;\"><strong>Explore<\/strong><\/h3>\r\n<ul>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=30764\">\u697d\u3057\u3044\u5b9f\u9a13<\/a>\u2026\u304a\u5b50\u3055\u3093\u3068\u4e00\u7dd2\u306b\u5922\u4e2d\u306b\u306a\u308c\u308b\u30a4\u30c1\u30aa\u30b7\u306e\u79d1\u5b66\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u9ad8\u6821\u7269\u7406\u306e\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306e\u52d5\u753b\u6559\u6750\u3082\u7528\u610f\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=798\">\u7406\u79d1\u306e\u6559\u6750<\/a>\u2026 \u7406\u79d1\u6559\u5e2b\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\uff01\u6388\u696d\u306e\u8cea\u3092\u9ad8\u3081\u3001\u6e96\u5099\u3092\u52b9\u7387\u5316\u3059\u308b\u305f\u3081\u306e\u9078\u308a\u3059\u3050\u308a\u306e\u6559\u6750\u3092\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/www.youtube.com\/c\/kkuwako\">Youtube<\/a>\u2026\u79d1\u5b66\u5b9f\u9a13\u7b49\u306e\u52d5\u753b\u3092\u914d\u4fe1\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/music.youtube.com\/playlist?list=PLoK4ZvKN9S2NgpYIochcQs0aL-vrRB_Qw\">\u79d1\u5b66\u30e9\u30b8\u30aa<\/a>\u00a0\u2026\u79d1\u5b66\u30c8\u30d4\u30c3\u30af\u3092\u307b\u307c\u6bce\u65e5\u914d\u4fe1\u4e2d\uff01AI\u6280\u8853\u3092\u99c6\u4f7f\u3057\u3066\u4f5c\u6210\u3057\u305f\u300c\u8033\u3067\u697d\u3057\u3080\u79d1\u5b66\u300d\u3092\u304a\u5c4a\u3051\u3057\u307e\u3059\u3002<\/li>\r\n<li><a href=\"http:\/\/phys-edu.net\/wp\/?page_id=20940\">\u8b1b\u6f14<\/a>\u00a0\u2026\u5168\u56fd\u5404\u5730\u3067\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u30fb\u30b5\u30a4\u30a8\u30f3\u30b9\u30b7\u30e7\u30fc\u7b49\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>\r\n","protected":false},"excerpt":{"rendered":"<p>This is Kuwako Lab, your science trainer. Every day is an experiment. What if I told you that an ordinary bent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":35332,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":""},"categories":[781],"tags":[],"class_list":["post-63221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/5247fe1631e7f6b7b020315f80779ab0-1.jpg","jetpack-related-posts":[{"id":52468,"url":"https:\/\/phys-edu.net\/wp\/?p=52468&lang=en","url_meta":{"origin":63221,"position":0},"title":"We Built a Volcano\u2014and It Was Explosively Fun! The Ultimate Experiment Recipe Using Plaster and Baking Soda!","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u670817\u65e5","format":false,"excerpt":"I'm Ken Kuwako, a science trainer. Every day is an\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/10\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-20-6.05.16.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/10\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-20-6.05.16.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/10\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-20-6.05.16.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/10\/%E3%82%B9%E3%82%AF%E3%83%AA%E3%83%BC%E3%83%B3%E3%82%B7%E3%83%A7%E3%83%83%E3%83%88-2025-07-20-6.05.16.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":51145,"url":"https:\/\/phys-edu.net\/wp\/?p=51145&lang=en","url_meta":{"origin":63221,"position":1},"title":"Get hands-on with the Law of Inertia! 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