Foams and Emulsions

Foam: Air bubbles suspended in a liquid; whipped cream, foam on a cappuccino.

Ice cream is a mixture of an emulsion and a foam.

Ice cream in a bag:

v  1 tablespoon sugar

v  1/2 cup milk or half & half

v  1/4 teaspoon vanilla

v  6 tablespoons rock salt

v  1 pint-size plastic food storage bag (e.g., Ziploc) 

v  1 gallon-size plastic food storage bag

v  Ice cubes

How to make it:

1. Fill the large bag half full of ice, and add the rock salt. Seal the bag.
2. Put milk, vanilla, and sugar into the small bag, and seal it.
3. Place the small bag inside the large one, and seal it again carefully.
4. Shake until the mixture is ice cream, which takes about 5 minutes.
5. Wipe off the top of the small bag, then open it carefully. Enjoy!