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Making Ice CreamMaking Ice Cream

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The Roosevelt High School Physics class gave a demonstration on making ice cream without an ice cream making machine. Sandwich bags and people power was used instead.

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Making Ice CreamMaking Ice Cream

Milk, vanilla flavor, sugar, (chocolate or strawberry) syrup was put in a small sandwich bag. This small sandwich bag was placed in a larger sandwich bag that contained ice and salt.

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Making Ice CreamMaking Ice Cream

The milk, vanilla, sugar, and syrup solution is shown being poured into a sandwich bag.

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The bag of solution within another bag of solution is spun around by hand (the students above put both bags in plastic containers to help with the spinning process). The saltwater solution draws heat energy from the milk solution it has come in contact with. The milk solution, now with less heat, freezes within minutes.

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Making Ice CreamMaking Ice Cream

This is a video of my Pulaski Middle School science students making ice cream.

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Another example of how heat energy is usually the product of an energy transformation. Heat from the milk solution bag was drawn out to help supply heat energy to the saltwater solution bag.

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The end result was several cups of great tasting ice cream.