Frost Experiment

By | March 29, 2014

Frost Experiment
If you live someplace where the temperatures drop below freezing then you are familiar with Frost.  We have left for school on many a morning and have seen the grass covered in a white shiny frost.  With my oldest daughter being six and my youngest three, you can imagine that I have been asked on several occasions “MOM WHAT’S THAT!”  So I thought we would do a simple Frost Experiment to show the girls what frost is and how it is formed.

This experiment is very easy and only takes a few minutes for the frost to form.  But the kids really enjoy it because not only can they see the frost that they have been curious about, but they can touch it and even taste it (yep they both put their frosty finger in their mouths).

What is happening with this experiment? The salt lowers the melting point of the ice and causes the surface of the can to be at a below freezing temperature.  Then the water vapor in the air around the can condenses and freezes on the can causing the Frost.
Frost will only form on the can if the temperature is below freezing, so if you just add the ice to the can with out the salt to lower the melting point you will get condensation on the can but not Frost.

Check out our other EXPERIMENTS and visit our SCIENCE Pintrest board for more Fun Science!


Tin Can
Salt (rock salt or sea salt work better than table salt)


Put ice and salt in your canPut ice in your can then pour some salt in (the salt will speed up the experiment)

Watch as Frost forms on canAfter a few minutes you will see the Frost forming on the outside of the can

Let the kids touch the frostLet the kids touch the Frost and see that it is like ice, that it is cold, and wet.


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25 thoughts on “Frost Experiment

  1. Mary

    I just posted using science journals as you conduct experiments. They are great keepsakes for the family. check out my samples on my blog.

      1. Me


  2. abedabun dawn

    This was years ago, but I put a coke in the freezer for about 30 min. to hurry and cool it. When I took it out (it was not frozen), though I did not mean to, I sit it on the table a little to hard and the coke froze. I dont remember but I think I actually dropped it on the table, maybe it slipped out of my hand, I really do not remember.

  3. Christy

    That’s great… and from that you could go into a discussion about how to make ice-cream using salted-ice to cool the cream, like in the old fashioned ice-cream makers (or using two layers of strong ziplock bags to seperate salted-ice from cream).

    1. wemadethat Post author

      Great idea! This would be a great project to lead up to making old fashioned ice-cream. I think my dad still has one of those makers too. We made a lot of ice-cream when we were little!


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  4. Kristina & Millie

    My son, when in middle school, was totally fascinated by the freezer – so many experiments with cans, bowls, tinfoil and various ingredients – ice, water, soap, shampoo and stuff I am not sure about…he would love this experiment for sure!

  5. Jill

    This is a really great idea. Hands on learning with a touch of fun!

    Thank you for stopping by the Thoughtful Spot Weekly Blog Hop this week. We hope to see you drop by our neck of the woods next week!

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