Science Lessons From Making Freezer Bag Ice Cream

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I have been working with a bright young third grader, asking him to work hard and pay attention so one day I felt like it was time for a reward. I decided it was a good day for Science Lessons From Making Freezer Bag Ice Cream.

Science Lessons From Making Freezer Bag Ice Cream; Children learn about the scientific method and matter. Free printable included

Science Lessons From Making Freezer Bag Ice Cream

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Of course, my goal is always to teach and encourage progress which means that I couldn’t simply make ice cream with him. I wanted to include some science. I thought that there would be many Science Lessons From Making Freezer Bag Ice Cream.

Simple Science Experiments for Kids 

Before we made the ice cream we did some experiments. First, we took two glasses of water and put the rock salt into one of the glasses. The glasses went into the freezer and every 15 minutes we checked to see what happened. It’s pretty fun to see kids get so interested in the simplest things. He needed to really examine the glasses of water and observe how it was freezing. We talked about how salt is used to melt ice and how salt water freezes at a much lower temperature. Why is salt used to make ice cream? It allows the temperature of the mixture around the ice cream to get colder. You can read more about the science of freezing salt water here. The glass on the left is fully frozen after one hour while the glass on the right with salt water is kind of slushy.

Science Lessons From Making Freezer Bag Ice Cream

The science behind bubbles

Then I had him get another glass with a little water and dish soap. I gave him a straw and told him to blow bubbles. He had a lot of fun making a bubbling mountain. We talked about what was happening. The volume had expanded, it was flowing out of the glass and into the sink. Why? We had added air and vibration. I explained to him that is what we would do with the ice cream. By shaking and throwing the ice cream ingredients we would be adding air and vibration so the final product would have more volume than what we started with. (A 1/2 cup of half and half will make 1 cup of ice cream.) The bubbles were really engaging for him. I wanted to go off on a tangent and explore the science of bubbles but I left that for another day.

Blowing Bubbles

Learning about Matter

Introduce the children to the three stages of matter. Matter can move from one state to another, but can still be the same substance. Not everything can change from one matter to another. For example, a diamond is always solid. Have the kids think about things that can change their stages of matter, like snow and chocolate. The faster the molecules move determines the stage of matter. Temperature affects how fast the molecules move. Gas has the fastest moving molecules and solids the slowest. You can demonstrate the process by melting ice cube and heating them until you make steam.

Introduce children to the scientific method

Finally, it was time to make ice cream! Like I said before, I want to add lessons while we are having fun. I made a scientific method worksheet for him to record our experiment. He gave it the title of Making Ice Cream. It amused me when he wrote his hypothesis: “The half and half will not turn into ice cream.” After he had written the materials and procedure it was time to actually make the ice cream.

Science Lessons From Making Freezer Bag Ice Cream; Children learn about the scientific method and matter. Free printable included

To make Freezer Bag Ice Cream you will need:

  • Small freezer bag
  • Large freezer bag
  • 1/2 cup of half and half
  • 1 TBS sugar
  • 1 tsp vanilla
  • 1/2 cup of rock salt (our store called it “ice cream salt”)
  • Crushed Ice

Instructions for making Freezer Bag Ice Cream:

  • Put the half and half, vanilla and sugar into the small bag. I use two bags just in case one breaks.
  • Put the smaller bag(s) into the larger bag. Again I double up the bags because they usually break.
  • Put the ice and salt into the bigger bag.
  • Shake, smash, throw until the half and half has frozen and become ice cream. Stop and take some time to observe what is happening.
  • Measure how much ice cream you have. Is it more than the 1/2 cup that you started with? Why?

Extending the activity:

  • Use cream instead of half and half. Is there a difference? Why?
  • Use almond milk instead of half and half. Is there a difference? Why? (Hint: the fat content makes a difference.)

By the time that we were done my young friend had learned many science lessons from making Freezer Bag Ice Cream but in his mind, he had just had a fun time playing and eating a delicious cool treat.

Science Lessons From Making Freezer Bag Ice Cream

27 Comments





  1. I love educational activities that have a built-in reward! What a great project! Thanks for linking up at the Manic Mondays blog hop 🙂

    Reply

    1. Thanks, Maeredith. We love stopping by Manic Mondays and checking out all the posts.

      Reply

  2. What a great idea! I love the fact that you had him write a hypothesis.

    Reply

    1. Thanks, I thought it was funny that I told him we were going to try to make ice cream and his hypothesis was that it wouldn’t work. 🙂

      Reply


  3. Ooo what a fab idea. I love posts that can help us to educate our children – there are so many wonderful ideas out there. Thanks for sharing and thanks so much for linking up with #TwinklyTuesday
    Please can you remember to use our badge next time 🙂

    Reply

    1. That’s great. Let us know how the kids like the science lesson. 🙂

      Reply

  4. What a fun science experiment?! Perfect for Summer! Definitely pinning and trying! Thanks for sharing & linking up to ‘Favorite Things Friday’ with Simply Rachel & Hip Homeschooling! (I would have loved to feature this on my site! Please make sure to link-back next time for feature consideration)!

    Reply

  5. We have making homemade ice cream on our Summer Checklist. This makes it so much more interesting when you add in the science aspect!!

    Reply

  6. I love how you both explained and illustrated the science of it all first. That said, I cannot wait to try making ice cream with my kids 🙂

    Reply

    1. Thanks for hosting Favorite things Friday!

      Reply

  7. I have yet to do this with my kids. What a fun way to encourage learning while making a yummy treat!!

    Reply

    1. Thanks, Tarynn! We like to have fun while we learn!

      Reply

  8. I remember doing something like this with my mom when I was little. You have the best experiments for kids! I’m sure my son would love to eat all the ice cream 🙂

    Reply

    1. Thanks! Kids have a lot of fun with this activity. If you try it let us know what your son thinks.

      Reply

  9. Love this! My kids will really enjoy this. I’m interested to see what would happen with almond milk.

    Reply

    1. Thanks, the Almond Milk will need more shaking because it has less fat.

      Reply

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