Hot and Cold Water Density Experiment

A Peculiar Playdate #6 ∙ Published Jan 2, 2019
hot and cold water density experiment - Keedoo holds cold water cup on top of hot
Hot and cold water density experiment! What is it all about? Well, we know that water usually flows down, right? Except it doesn’t need to. In this experiment, we’d like to show that it is possible to make the water flow upwards. It is a little intricate, but with a bit of practice you can master it and impress kids during next playdate!
What you need
  • Hot water
  • Cold water
  • Two glasses
  • Some sort of a plastic card
  • Food coloring to make the experiment more visual. We used red for hot and blue for cold water.
Keedoo hot and cold water density experiment - things you need
How to make it
Step 1

Place a plastic card on top of the glass with cold (blue) water

Keedoo hot and cold water density experiment - rotate a glass with cold water and card
Step 2

Now quickly rotate the glass upside down!

Keedoo hot and cold water density experiment - glass with cold water placed on glass with hot
Step 3
Place the blue water glass onto the red one with hot water, and align them
Keedoo hot and cold water density experiment - cold water on top of hot
Step 4
Carefully remove the card
What happens
The hot water will flow up! Gradually, the blue, cold water will mix with hot one and you’ll see purple water!
Keedoo hot and cold water density experiment - pulling card from inbetween the glasses
Keedoo hot and cold water density experiment - cold and hot water mixed 2
Keedoo hot and cold water density experiment - cold and hot water mixed
Why it happens
It is all about a difference between hot and cold water density. Cold water is much heavier than a hot one. On the other hand, hot water is lighter and tends to go up.
What now
If you wish to demonstrate the effects of water density even further, consider placing a glass with hot water on top of the one with cold. You’ll see that the water will stay in place and won’t mix!
Keedoo hot and cold water density experiment - hot water on top of cold 1
Keedoo hot and cold water density experiment - hot water on top of cold 2
Keedoo hot and cold water density experiment - hot water on top of cold 3

Feathers in exchange for prizes

While working on this playdate idea, our Keedoo Parrot has lost four feathers 😔 Please help us! Collect them by bringing this idea to life with your kids, and we will gratefully exchange them for valuable prizes.
  1. Try making this experiment
  2. Share your experience on Instagram or Facebook
  3. Mention @keedooapp in comments
  4. Nominate two families to do the same
  5. We will contact you to add four feathers to your Keedoo account that you can exchange for prizes in our mobile app
  6. Follow @keedooapp on Instagram to see new prizes
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