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💫Magical 🌀Hydrogels • Kids ⚗️Science Experiment 💦Trick •🔬⚖️ 101 🎥Series 

Happy ❄️February 1st! Have you wondered what to do with an old monthly 🗓calendar? A 🤗fun kids ⚗️science experiment of course! This is a cool trick your kids will 💙love when they see the 💫magic unfold in front of their eyes! A magically appearing image and magically disappearing 🌀hydrogels ~ water-beads!   

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 mystery💡revealed: 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 🎥 video of how we "made" hydrogel beads in Sensory Exploration with Hydro Gel ❤️️ Water Beads. 

For more on fun Science, see here "Rainbow 🌈Colorful Skittles Fun💧 Water Science Experiment for Kids •🔬⚗️⚖️  101 🎥 Series" and see here a video-post "Lava Lamp: Oil vs 🌈 💧Water Density Immiscibility ⚗️Experiment with 💥Alka Seltzer."

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