Science at Home: Water Molecules on the Move

Science at Home: Water Molecules on the Move

This experiment is great for testing if hot water molecules really move faster than cold ones. Pour some water, drop in some food coloring and compare results.


What you’ll need:
  • A clear glass filled with hot water
  • A clear glass filled with cold water
  • Food coloring
  • An eye dropper
  1. Fill the glasses with the same amount of water, one cold and one hot.
  2. Put one drop of food coloring into both glasses as quickly as possible.
  3. Watch what happens to the food coloring.
  4. Leave the glasses out in the sun for a couple of hours before returning to measure the temperature of the water in each.
What’s happening?

If you watch closely, you will notice that the food coloring spreads faster throughout the hot water than in the cold. The molecules in the hot water move at a faster rate, spreading the food coloring faster than the cold water molecules which move slower.



How did yours turn out? Send us a picture or video of your experiment to and we’ll feature it on our blog for the #NoniTribe


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