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Hot water, cold water - Science - Educatall

Globule wonders...Globule

What is heavier? Hot water or cold water?


Experiment: Hot water, cold water


Hypotheses: Present children with the question. Ask them if they have ever gone swimming in a lake. If they have, ask them if they noticed that the water at the surface was warmer than the water in the bottom.



  • A large transparent bowl or vase
  • A plastic bottle containing very hot tap water or boiling water
  • A plastic bottle containing very cold water, placed in the refrigerator prior to the experiment
  • Red and blue food colouring


  1. Be careful! Hot water can burn you! Do this experiment with your daycare worker's help.

  2. Add a few drops of red food colouring to the bottle containing hot water and a few drops of blue food colouring to the bottle containing cold water.

  3. Pour water from the cold water bottle into the vase until it is half full.

  4. Gently pour hot water onto the cold water. Watch what happens.

Explanations: The cold water remains at the bottom of the vase since it is denser than the hot water. The water particles in the cold water are much closer together and it therefore appears to be heavier. On the other hand, the water particles in the hot water are farther apart making it lighter and therefore allowing it to float on top of the cold water.



Angélique Boissonneault

has a Bachelor's Degree in Biological Science. She has worked in a laboratory and tested her knowledge. She has taught Math, Chemistry, and Physics. She has also developed a simplistic and innovative approach designed to introduce young children to scientific experiments, old and new. She created her friend Globule. This character is sometimes red, and sometimes white. He guides little ones through their scientific experiments and discoveries. It is clear to see Angélique is passionate about children and science. Globule's Approach.


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