{"id":66931,"date":"2026-08-28T04:39:42","date_gmt":"2026-08-27T19:39:42","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=66931"},"modified":"2026-08-28T04:39:42","modified_gmt":"2026-08-27T19:39:42","slug":"recreating-an-earthquake-in-a-cup-why-grain-size-decides-soil-liquefaction","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=66931&lang=en","title":{"rendered":"Recreating an Earthquake in a Cup! Why Grain Size Decides Soil Liquefaction"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I\u2019m Ken Kuwako, your Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n<p>Have you ever seen news footage of a supposedly sturdy building tilting after an earthquake, or manholes suddenly popping up out of the ground? The culprit may be a phenomenon called \u201csoil liquefaction,\u201d in which the ground behaves almost like a liquid. This time, I recreated this fascinating phenomenon as a simple classroom experiment using an everyday item: plastic cups.<\/p>\n<p>For this liquefaction experiment, I prepared three types of material: sand, soil with smaller particles than sand, and gravel with larger particles than sand. I filled a 100 mL beaker with each material and transferred it into plastic cups, preparing a total of 20 cups.<\/p>\n<h3>Setting Up the Experiment and Creating an Earthquake<\/h3>\n<p>I gradually added water to the sand in the cups, making sure the entire sample was thoroughly wet. If water appeared on the surface, I gently wiped it away with a tissue so that the surface was left dry. Then, I created an \u201cearthquake\u201d by shaking the cup from side to side.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u30d7\u30e9\u30ab\u30c3\u30d7\u3092\u4f7f\u3063\u305f\u6db2\u72b6\u5316\u73fe\u8c61\u306e\u5b9f\u9a13\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/rOkV77-6D5s?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<p>There were 10 groups, so I gave each group two cups and had them shake just one of the two.<\/p>\n<p>Before shaking<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-41392 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/ea59cd02d135b1438bb2e8c67f53b46b.jpg\" alt=\"\" width=\"365\" height=\"448\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/ea59cd02d135b1438bb2e8c67f53b46b.jpg 688w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/ea59cd02d135b1438bb2e8c67f53b46b-245x300.jpg 245w\" sizes=\"auto, (max-width: 365px) 100vw, 365px\" \/><\/p>\n<p>After shaking<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-41393 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/95f1389b30f12a092752ab669795d624.jpg\" alt=\"\" width=\"365\" height=\"443\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/95f1389b30f12a092752ab669795d624.jpg 788w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/95f1389b30f12a092752ab669795d624-247x300.jpg 247w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/95f1389b30f12a092752ab669795d624-768x932.jpg 768w\" sizes=\"auto, (max-width: 365px) 100vw, 365px\" \/><\/p>\n<p>As you can see, after shaking, water rises to the surface. But here\u2019s the important point: <strong>the height of the material remains almost exactly the same<\/strong> before and after shaking.<\/p>\n<h3>\u201cThe Height Looks the Same, So Why Does Water Come Out?\u201d<\/h3>\n<p>In fact, this very fact\u2014that the overall height doesn\u2019t change\u2014is key to understanding what liquefaction is all about.<\/p>\n<p>There is naturally water in the tiny spaces between sand particles. When the ground is undisturbed, the sand grains fit together and support one another, with water trapped in those spaces.<\/p>\n<p>But when the ground is shaken from side to side, this arrangement of sand grains can momentarily collapse, allowing the particles to move around more freely. As a result, the water trapped between the grains gets squeezed out and rises toward the surface.<\/p>\n<p>So, even though the overall volume\u2014and therefore the height\u2014barely changes, the water that has lost its support is pushed upward. That is the basic mechanism behind soil liquefaction.<\/p>\n<h3>\u201cParticle Size\u201d Makes All the Difference<\/h3>\n<p>When I tried the same experiment with soil, there was very little liquefaction&#8230;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-41394 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/15de74d98f91c8c989fe714a8977aea1.jpg\" alt=\"\" width=\"358\" height=\"446\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/15de74d98f91c8c989fe714a8977aea1.jpg 646w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/15de74d98f91c8c989fe714a8977aea1-241x300.jpg 241w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/><\/p>\n<p>And when I tried it with gravel, almost no liquefaction occurred.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-41395 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/2a294863e70423bbb04ffac6c1066a38.jpg\" alt=\"\" width=\"356\" height=\"378\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/2a294863e70423bbb04ffac6c1066a38.jpg 866w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/2a294863e70423bbb04ffac6c1066a38-282x300.jpg 282w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/11\/2a294863e70423bbb04ffac6c1066a38-768x816.jpg 768w\" sizes=\"auto, (max-width: 356px) 100vw, 356px\" \/><\/p>\n<p>What\u2019s interesting is that liquefaction doesn\u2019t occur very easily when the particles are much smaller than sand\u2014or when they are much larger. There\u2019s more to this phenomenon than meets the eye!<\/p>\n<p>These results demonstrate an important geological characteristic of liquefaction: it tends to occur most readily when the particles are just the right size.<\/p>\n<p>Fine-grained soil, such as clay-rich material, tends to have particles that stick together through electrical forces and other interactions. The spaces between the particles are also extremely small, making it difficult for water to move through them. As a result, even when the ground shakes, water is less likely to be forced out.<\/p>\n<p>Coarse gravel, on the other hand, has relatively large spaces between its particles. However, the rough, chunky particles interlock with one another, forming a fairly stable structure that is difficult to collapse with ordinary shaking.<\/p>\n<p>Sand falls right in the middle. Its particles are loose enough to rearrange during shaking, while the spaces between them allow water to move relatively easily. That combination makes sand particularly susceptible to liquefaction.<\/p>\n<p>This is closely related to what happens during actual earthquakes. Liquefaction damage is frequently reported in sandy ground, especially in reclaimed land and areas along rivers, where the ground conditions provide just the right combination of particle size and water content.<\/p>\n<p>I also tried the experiment using a fish tank. It\u2019s much more dramatic than the plastic-cup version, although preparing one for every group takes a little more work.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u81ea\u5b85\u3067\u7c21\u5358\uff01\u6db2\u72b6\u5316\u73fe\u8c61\u306e\u5b9f\u9a13\uff08\u7802\u3068\u571f\u306e\u5834\u5408\uff09\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/J9VIvum_XRA?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<p>Before shaking.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-39500\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/59ba238c0438daa384863812741966da.jpg\" alt=\"\" width=\"1504\" height=\"856\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/59ba238c0438daa384863812741966da.jpg 1504w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/59ba238c0438daa384863812741966da-300x171.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/59ba238c0438daa384863812741966da-1024x583.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/59ba238c0438daa384863812741966da-768x437.jpg 768w\" sizes=\"auto, (max-width: 1504px) 100vw, 1504px\" \/><\/p>\n<p>After shaking.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-39501\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/e3a8c39cf89b514a0b3b6347b6e85234.jpg\" alt=\"\" width=\"1508\" height=\"884\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/e3a8c39cf89b514a0b3b6347b6e85234.jpg 1508w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/e3a8c39cf89b514a0b3b6347b6e85234-300x176.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/e3a8c39cf89b514a0b3b6347b6e85234-1024x600.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/e3a8c39cf89b514a0b3b6347b6e85234-768x450.jpg 768w\" sizes=\"auto, (max-width: 1508px) 100vw, 1508px\" \/><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-39503\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141.jpg\" alt=\"\" width=\"1802\" height=\"1036\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141.jpg 1802w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141-300x172.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141-1024x589.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141-768x442.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/1e842c4dc2eb2c964b06cbe9de037141-1536x883.jpg 1536w\" sizes=\"auto, (max-width: 1802px) 100vw, 1802px\" \/><\/p>\n<h3>Sand and Mud: Both Look Like \u201cGround,\u201d but They Behave Very Differently<\/h3>\n<p>I also replaced the sand with mud and repeated the same experiment. The result was clear: compared with sand, the mud showed much less liquefaction.<\/p>\n<p>Here is the mud before shaking.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-39504\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/dc78bf0111d4fbf9bfd1e9fbef78d42e.jpg\" alt=\"\" width=\"1276\" height=\"792\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/dc78bf0111d4fbf9bfd1e9fbef78d42e.jpg 1276w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/dc78bf0111d4fbf9bfd1e9fbef78d42e-300x186.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/dc78bf0111d4fbf9bfd1e9fbef78d42e-1024x636.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/dc78bf0111d4fbf9bfd1e9fbef78d42e-768x477.jpg 768w\" sizes=\"auto, (max-width: 1276px) 100vw, 1276px\" \/><\/p>\n<p>After shaking.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-39502\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922.jpg\" alt=\"\" width=\"1548\" height=\"874\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922.jpg 1548w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922-300x169.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922-1024x578.jpg 1024w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922-768x434.jpg 768w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922-1536x867.jpg 1536w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/02\/f23e7cd41c5492702b45f392e6b54922-320x180.jpg 320w\" sizes=\"auto, (max-width: 1548px) 100vw, 1548px\" \/><\/p>\n<p>Sand and mud may look quite similar when we simply think of them as \u201cground,\u201d but their particle sizes and composition are very different. As a result, they can behave very differently when subjected to an earthquake.<\/p>\n<p>It\u2019s fascinating how simply changing one plastic cup or switching the type of particles can completely change the outcome. This simple experiment reminds us that the \u201cground\u201d we casually walk on every day is actually supported by a surprisingly delicate balance.<\/p>\n<h3>Contact &amp; Inquiries<\/h3>\n<p>Want to bring the wonder and excitement of science a little closer to home? I share fun science experiments you can try yourself, along with useful tips and tricks, all explained in an easy-to-understand way. Have a look around and see what you can discover!<\/p>\n<p>\u30fbThe Science Notebook has now been published as a book. For more information, click <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a>.<br \/>\n\u30fbFor more information about Ken Kuwako, the creator of this site, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a>.<br \/>\n\u30fbFor inquiries and requests, including writing, lectures, science workshops, TV science supervision, and appearances, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a>.<br \/>\n<span class=\"s2\">\u30fbGet updates whenever new articles are published 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 Tricks Channel<\/a> features videos of science experiments!<\/p>\n<h3>\uff19\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n\u304a\u5f01\u5f53\u7bb1\u3092\u30d7\u30e9\u30d0\u30f3\u304c\u308f\u308a\u306b\u3057\u3066\u30ad\u30fc\u30db\u30eb\u30c0\u30fc\u3092\u4f5c\u308d\u3046\uff01\r\n<p style=\"text-align: center;\"><a href=\"https:\/\/phys-edu.net\/wp\/?p=35313\">\u30d7\u30e9\u30b9\u30c1\u30c3\u30af\u304a\u5f01\u5f53\u7bb1\u3092\u4f7f\u3063\u305f\u30ad\u30fc\u30db\u30eb\u30c0\u30fc\u4f5c\u308a\uff01<\/a><\/p>\r\n<p style=\"text-align: center;\"><img class=\"alignnone wp-image-35705 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/69951296b11caa484208330661c3ad16.jpg\" sizes=\"auto, (max-width: 449px) 100vw, 449px\" 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\" alt=\"\" width=\"449\" height=\"195\" \/><\/p>\r\n\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 \t<li>\uff18\u6708\uff12\uff17\u65e5\uff08\u6728\uff09\u79d1\u5b66\u76e3\u4fee\u756a\u7d44\u653e\u9001\u4e88\u5b9a<\/li>\r\n \t<li>\uff19\u6708\uff12\uff10\u65e5\uff08\u65e5\uff09\u30c0\u30d3\u30f3\u30c1\u30de\u30b9\u30bf\u30fc\u30ba\u51fa\u6f14\u4e88\u5b9a<\/li>\r\n \t<li>\uff11\uff10\u6708\uff11\uff10\u65e5\uff08\u571f\uff0911:15~12:00\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=66205\">\u5343\u8449\u5e02\u79d1\u5b66\u30d5\u30a7\u30b9\u30bf2026\u300c\u6851\u5b50\u5148\u751f\u306e\u56de\u8ee2\u79d1\u5b66\u30b7\u30e7\u30fc\u300d\u306b\u3066\u30b5\u30a4\u30a8\u30f3\u30b9\u30b7\u30e7\u30fc\u3092\u884c\u3044\u307e\u3059<\/a>\u3002<\/li>\r\n \t<li>12\u670826\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=64825\">\u30ca\u30ea\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\uff08\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\uff09\u958b\u50ac<\/a><\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n \t<li>\u300e<a href=\"https:\/\/phys-edu.net\/wp\/?p=64462\">\u9ad8\u6821\u5165\u8a66 \u5206\u89e3\u554f\u984c\u96c6 \u7406\u79d1<\/a>\u300f\uff08\u5b66\u7814\uff09\u2026\u96e3\u3057\u3044\u554f\u984c\u3082\u5c0f\u3055\u306a\u554f\u984c\u306b\u5206\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u3093\u306a\u5206\u89e3\u306e\u6280\u8853\u304c\u8eab\u306b\u3064\u304f\u3088\u3046\u306b\u6df1\u304f\u95a2\u308f\u308a\u3092\u6301\u3063\u3066\u4f5c\u308a\u307e\u3057\u305f\u3002\r\n<a href=\"https:\/\/phys-edu.net\/wp\/?p=64462\"><img class=\"alignnone  wp-image-65097 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2026\/07\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-07-04-8.40.17.jpeg\" alt=\"\" width=\"172\" height=\"244\" \/><\/a>\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\r\n<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\" \/><\/strong><\/li>\r\n \t<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\r\n<img class=\"alignnone wp-image-45718 aligncenter\" 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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 \t<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 \t<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 \t<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 \t<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 \t<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a>\u00a0\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>","protected":false},"excerpt":{"rendered":"<p>I\u2019m Ken Kuwako, your Science Trainer. Every day is an experiment. Have you ever seen news footage of a suppose [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":41393,"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":"","jetpack_post_was_ever_published":false},"categories":[781],"tags":[],"class_list":["post-66931","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack-related-posts":[{"id":54558,"url":"https:\/\/phys-edu.net\/wp\/?p=54558&lang=en","url_meta":{"origin":66931,"position":0},"title":"The Earthquake Experiment: Watch Your Desk Turn to Quicksand!","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u670818\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\/2025\/03\/333802a3d502a1e121fcaf81a062f770.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/03\/333802a3d502a1e121fcaf81a062f770.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/03\/333802a3d502a1e121fcaf81a062f770.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2025\/03\/333802a3d502a1e121fcaf81a062f770.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":65042,"url":"https:\/\/phys-edu.net\/wp\/?p=65042&lang=en","url_meta":{"origin":66931,"position":1},"title":"How Buildings Fight Back Against Earthquakes: From Liquefaction to Sloshing Dampers, Fully Explained [Miraikan]","author":"\u6851\u5b50 \u7814","date":"2026\u5e747\u67083\u65e5","format":false,"excerpt":"I'm Ken Kuwako, the Science Trainer. Every day is \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\/2021\/04\/b2bff7776667fc4a245557c670c52ec5.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/b2bff7776667fc4a245557c670c52ec5.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/b2bff7776667fc4a245557c670c52ec5.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/b2bff7776667fc4a245557c670c52ec5.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2021\/04\/b2bff7776667fc4a245557c670c52ec5.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":53458,"url":"https:\/\/phys-edu.net\/wp\/?p=53458&lang=en","url_meta":{"origin":66931,"position":2},"title":"Make Your Own Earth Cake: The Fun, Hands-On Strata Experiment!","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u670830\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your Science Trainer. Every day is\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\/12\/382415d2ef173e3f33b7f6d83d1b3fa4.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/12\/382415d2ef173e3f33b7f6d83d1b3fa4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/12\/382415d2ef173e3f33b7f6d83d1b3fa4.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/12\/382415d2ef173e3f33b7f6d83d1b3fa4.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":54037,"url":"https:\/\/phys-edu.net\/wp\/?p=54037&lang=en","url_meta":{"origin":66931,"position":3},"title":"The Desk-Lifting Trick: How Invisible Air Can Lift a Cow (Seriously!)","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u67088\u65e5","format":false,"excerpt":"I'm Ken Kuwako, a Science Trainer, and every day i\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\/2023\/12\/c3b38a2ea516170baad2c0f63cf042ff.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/12\/c3b38a2ea516170baad2c0f63cf042ff.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/12\/c3b38a2ea516170baad2c0f63cf042ff.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2023\/12\/c3b38a2ea516170baad2c0f63cf042ff.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":52545,"url":"https:\/\/phys-edu.net\/wp\/?p=52545&lang=en","url_meta":{"origin":66931,"position":4},"title":"Volcanic Ash Turns into Gems? Tips for a Sparkling \u201cBowl Sedimentation\u201d Classroom Experiment","author":"\u6851\u5b50 \u7814","date":"2025\u5e749\u670817\u65e5","format":false,"excerpt":"I'm Ken Kuwako, your science trainer. 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