Unwettable Sand
Materials
Instructions
Reach into your kit & pull out the bag with the pink powder in it. Place everything around the white mat, and put the bag back in your box.
Open the top of the pink unwettable sand and pour in enough to cover the bottom of the petri dish.
Grab your pipette, squeeze the top bulb, place the tip into the water, and release the bulb to suck up some water into the pipette.
Drip the water onto the sand. Just squeeze a little bit at a time. Try making lots of little dots and see how they just run off the top of the sand.
Shake it a little to move the water to the sides. Then, make a crater in the center of the sand.
Drip the water into the center of your crater. Keep adding more water to see how big your bubble of water can get.
Add water around the edges to create a ring of water. You can even shake it around, the sand doesn’t get wet.
Take the cup of water and place it in the center of your mat and move the petri dish to the side.
Grab the spoon, and try to take some of the sand out of the water. Try it again, every time you put the sand back in the water and take it out, it’s still dry!
How It Works
The fabric we used also has a hydrophobic coating, and it repels water. This material has many uses too, like making raincoats that need to stay dry.
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