Science Project: Ice Cream in a Bag

My daughter did this one in 3rd grade and loved it mostly because she had a delicious treat in the end. It was amazing to see the liquid turn to solid just from shaking it! And it was so cold we had to wear gloves to hold the bag!

More Science Projects

What You’ll Need:

  • 1/2 cup milk
  • 1/2 cup whipping cream  or heavy cream
  • 1/4 cup white sugar
  • 1/4 teaspoon vanilla extract
  • 1/2 to 3/4 cup salt (sodium chloride)
  • 2 cups ice


  • 1-quart Ziploc bag
  • 1-gallon Ziploc bag
  • Thermometer
  • Measuring cups and spoons
  • Bowls, cups, spoons or cones to serve your ice cream treat

1. Put 1/4 cup sugar, 1/2 cup milk, 1/2 cup cream, and 1/4 teaspoon vanilla in a quart Ziploc bag and seal it. Put the 2 cups of ice into the gallon Ziploc bag.

2. Use the thermometer to take the temperature of the ice in the bag and write it down.

3. Next add 1/2 to 3/4 cup salt (sodium chloride) to the bag of ice.

4. Put the sealed quart bag inside the gallon bag of ice and salt. Seal the gallon bag.

5. Shake the gallon bag for about 10-15 minutes until the cream becomes solid. We wore gloves because it gets VERY cold–0 degrees celsius!

6. Once the contents is solid, take the temperature again. See how much colder it is now?!

You could do this experiment as a comparison: one with salt and one without. When the salt isn’t added, the cream won’t solidify. You can read more about the experiment on Scientific American.


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Author: Heather Zachariah

Former Art Director for Home Magazine, Heather Leahy Zachariah, left her career in publishing after baby number number one. She now works from home as a freelance graphic designer and a chauffeur to her 3 busy kids. "Working on TipsFromTown has been a wonderful outlet for me. It renewed my love of publishing where I can design colorful, enticing pages online and allows me to share the things I love about being a mom." Heather grew up in Shaker Heights, Ohio, a place that still is near and dear to her. " After living in Brooklyn for 18 years and studying Graphic Design at Pratt Institute, she now lives in the Jersey burbs. "I love living so close to NYC, but in my heart, I'm an Ohio girl."


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