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Unwettable Sand

Autopause

Materials

1 Round Petri Dish
1 Round Petri Dish
1 Container of Pink Sand
1 Container of Pink Sand
2 Plastic Cups
2 Plastic Cups
1 Pipette
1 Pipette
1 Plastic Spoon
1 Plastic Spoon
1 Piece of Waterproof Fabric
1 Piece of Waterproof Fabric

Instructions

STEP 1
0:00

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.

STEP 2
0:17

Take the petri dish and place it in the middle of the mat.

STEP 3
0:23

Open the top of the pink unwettable sand and pour in enough to cover the bottom of the petri dish.

STEP 4
0:49

Take one of the plastic cups and fill it half way up with water.

STEP 5
1:06

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.

STEP 6
1:27

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.

STEP 7
1:59

Shake it a little to move the water to the sides. Then, make a crater in the center of the sand.

STEP 8
2:15

Drip the water into the center of your crater. Keep adding more water to see how big your bubble of water can get.

STEP 9
2:48

Add water around the edges to create a ring of water. You can even shake it around, the sand doesn’t get wet.

STEP 10
3:39

Take the cup of water and place it in the center of your mat and move the petri dish to the side.

STEP 11
3:50

Take the entire container of pink sand and dump it in the cup of water.

STEP 12
4:13

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!

STEP 13
4:54

Take the cup of water and gently pour it into the empty cup. Give the cup of sand a little shake to pull the rest of the water to the top and pour out as much as you can.

STEP 14
5:25

Now pour the sand back out onto your mat, it’s still dry!

STEP 15
6:26

Next, place your fabric down with the “x” or “star” facing up, towards you.

STEP 16
6:46

Using the pipette, suck up some water and drip it onto the material.

STEP 17
7:05

Keep adding drops of water. Try to connect the drops and make bigger ones.

STEP 18
7:28

Try playing a little game with all your water drops by moving the corners of the material and trying to get all of the water into one big drop.

How It Works

This material is just regular sand coated with a special substance that repels water. In science that’s called a hydrophobic coating. Hydro, means water, and phobic, means fearing. Water fearing. That means the sand repels water and it does not want to get wet. When you put water on top of it, it doesn’t mix. Now regular sand on the other hand will mix with water to make wet sand.

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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