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How to Make Ice Cream in a Bag

Experiments | 7-14 yrs | Learning Pod

Homemade Ice Cream in a Bag

It is midnight, and you are craving for some luscious ice cream; but unfortunately and depressingly, your elder brother finished the last scoop of it. What do you do? No store is open and your parents are fast asleep. How about making instant ice cream at home?

What You Need

  • A large plastic jar
  • 2 medium sized Ziploc bags
  • Crushed ice
  • Salt
  • Vanilla essence
  • Milk
  • Whipping cream
  • Sugar
  • Towel or gloves

Steps to Make Ice Cream in a Bag

  1. Fill the plastic jar halfway with 2 cups crushed ice and ½ cup of salt.
  2. Seal the plastic jar and shake the mixture for 5 minutes. Wrap your hands in the towel or gloves when you do that as the jar will be cold.
  3. In one Ziploc bag, mix ¼ cup sugar, ½ cup whipping cream, ½ cup milk and ¼ teaspoon vanilla essence.
  4. Seal the bag tightly, making sure there is minimum air inside.
  5. Put this bag in the other Ziploc bag. Again, seal it tightly.
  6. Put the 2 bags inside the jar and seal it. Again, shake it while your hands are wrapped in a towel or gloves.
  7. Now do your shake dance, and rock the bag to a rhythmic movement for 15 minutes. Now check the bag and what do you have? Ice cream has been made instantaneously.

How It Works

Sodium chloride (salt) lowers the freezing point of the ice, and causes the ice to melt faster. The ice also gets heat from your hands and from the milk mixture. When the freezing point is decreased of the ice, it causes the milk mixture to freeze quickly. Nero, the Roman emperor had commanded his slaves to bring ice from the mountains, which was used to freeze up homemade ice cream!

When the roads are icy in winter, salt is spread over the road, to make ice melt and prevent accidents.

For more such science experiments and articles for kids, visit http://mocomi.com/learn/science/

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