1 minute read

This experiment shows the difference in how food dye acts when in cold water and hot water.


Make science fun! Learn about the difference in cold water and hot water, and why!

Cold Water with Food Dye
Image of purple food dye in ice water, food dye settling at the bottom of the glass.
Hot Water with Food Dye
Image of purple food dye in hot water, food dye in a cloud in the center of the glass.


  • Food dye (any color)
  • Hot and cold water
  • 2 Jars or containers


Total: 20 minutes

  • Set up: 5 minutes
  • Clean up: 5 minutes


Steps for making your experiment!

  1. Gather your ingredients
  2. Add the hot water and cold water into their separate jars
  3. Add a few drops of food dye to each jar with water (add the food dye at the same time or one after another, quickly)
  4. Record what happened to the food dye in the water

Clean up!

  1. Dump out the water and wash out the food dye

Level of effort

Easy! Just adding food dye to water and recording the results!

Clean up: Level of effort

Once again easy!


Use a food color that you can easily see in the water.

  • Point out the that hot water has more thermal energy. We can see this energy by watching how the dye gets mixed into the water. More energy the faster the molecules “move” causing the dye to get mixed faster.