{"id":62005,"date":"2026-03-31T04:57:08","date_gmt":"2026-03-30T19:57:08","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=62005"},"modified":"2026-03-31T04:57:08","modified_gmt":"2026-03-30T19:57:08","slug":"recreate-a-sunset-with-a-plastic-bottle-discover-the-magic-of-light-scattering-with-milk","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=62005&lang=en","title":{"rendered":"Recreate a Sunset with a Plastic Bottle! Discover the Magic of Light Scattering with Milk"},"content":{"rendered":"

I’m Ken Kuwako, your Science Trainer. Every day is an experiment!<\/strong><\/span><\/p>\n

Have you ever gazed at a sunset so beautiful it took your breath away? Today, we\u2019re diving into one of the sky’s greatest mysteries: Why does the setting sun turn brilliant shades of orange and red? I\u2019ll show you a simple, fun experiment to recreate this magic right at home.<\/p>\n

The secret behind those stunning colors lies in a phenomenon called light scattering. It might sound technical, but once you see it in action, you’ll be hooked on the science behind it.<\/p>\n

As a bonus, we\u2019ll take a peek under the microscope to see the “secret ingredient” of our experiment\u2014milk particles\u2014moving around as if they were alive!<\/p>\n

\"\"<\/a><\/p>\n

The Science Recipe: Sunset in a Bottle
\nWhat You’ll Need:<\/p>\n

Two 1.5-liter plastic bottles<\/p>\n

Milk (Soapy water works too!)<\/p>\n

Water<\/p>\n

A flashlight (A powerful one with a focused beam works best)<\/p>\n

For the best results, use a high-intensity LED flashlight like the ones below:<\/p>\n

\"\"<\/a><\/p>\n

Amazon: Flashlight<\/a><\/p>\n

Rakuten: LED 13LED Super Light SV-3345<\/a><\/p>\n

Steps:<\/p>\n

Prep Time! Fill both plastic bottles to the brim with water.<\/p>\n

A Drop of Magic: Add just a few drops of milk to one bottle. You want the water to look slightly cloudy or hazy. Be careful not to overdo it! Use a dropper to add it one drop at a time until you get a faint tint.<\/p>\n

The Dark Room Test (The Comparison)<\/p>\n

\"IMG_2661\"<\/a><\/p>\n

Turn off the lights. Press your flashlight against the bottom of the plain water bottle. You\u2019ll see the light travel straight through, reaching the cap as a clear white beam.
\n\"\"<\/p>\n

The Main Event: Now, do the same with the milky bottle. Look closely at the bottle from the side, and then look directly at the cap (the “exit point”). Notice the difference!<\/p>\n

The Results:<\/p>\n