Place a few ice cubes into a cup and add two tablespoons of water to make very cold water. Add 1 drop of blue food coloring to the cold water and gently mix. Ask your adult partner to add two ...

In the hot (yellow) water, the water molecules are slightly further apart than in the cold (blue) water. The hot water is less dense and floats on the cold water. When the cold water is placed on top, ...