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Adrian 4 years Adrian 49 - 53 months SCIENCE ๐Ÿ”ฌ โš—๏ธโš–๏ธ Unit Study Winter

๐Ÿ’ซMagical ๐ŸŒ€Hydrogels โ€ข Kids โš—๏ธScience Experiment ๐Ÿ’ฆTrick โ€ข๐Ÿ”ฌโš–๏ธ 101 ๐ŸŽฅSeriesย 

Happy โ„๏ธFebruary 1st! Have you wondered what to do with an old monthly ๐Ÿ—“calendar? A ๐Ÿค—fun kids โš—๏ธscience experiment of course! This is a cool trick your kids will ๐Ÿ’™love when they see the ๐Ÿ’ซmagic unfold in front of their eyes! A magically appearing image and magically disappearing ๐ŸŒ€hydrogels ~ water-beads!   

https://player.vimeo.com/video/253894355

All transparent substances have a characteristic called refractive index, which determines how much the path of light is bent/refracted when entering a material.  In optics, the refractive index or index of refraction is a dimensionless number that describes how light propagates through that medium. We see a colorless object only because its refractive index differs from the refractive index of the medium, usually the air. (Read science mystery revealed below.)


 How to prepare this experiment:

DSC_0306 Grow hydrogels: pour water over dry clear water gel beads and wait for about an hour.

DSC_0306 Lay a laminated picture on the bottom of an empty tray (we are using an aluminum baking tray).

DSC_0306 Wait until hydrogels are fully expanded. 

DSC_0306Pour hydrogels over the picture and then add water and watch the magic unfold!

DSC_0314This tray is still filled with hydrogels which are now absolutely invisible, while the picture is visible!

Science mystery๐Ÿ’กrevealed: the refractive index of water is 1.333 (meaning that light travels 1.333 times slower in water than in the vacuum). The air, on the other hand, has a refractive index of almost 1. That is why we see water in the air or air bubbles in the water. 

The refractive index of clear see-through hydrogels is 1.5, that is why in the water, they become completely invisible! 

To observe how hydrogels grow real sped up time, see here a ๐ŸŽฅ video of how we "made" hydrogel beads in Sensory Exploration with Hydro Gel โค๏ธ๏ธ Water Beads. 

For more on fun Science, see here "Rainbow ๐ŸŒˆColorful Skittles Fun๐Ÿ’ง Water Science Experiment for Kids โ€ข๐Ÿ”ฌโš—๏ธโš–๏ธ  101 ๐ŸŽฅ Series" and see here a video-post "Lava Lamp: Oil vs ๐ŸŒˆ ๐Ÿ’งWater Density Immiscibility โš—๏ธExperiment with ๐Ÿ’ฅAlka Seltzer."

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