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Remove the labels from two tin cans, and half-fill one can with water, chips of ice, and a handful of salt to make the water very cold. Half-fill the second can with water only. Use two thermometers to record the temperature of the water in each can. Now stir the contents of each can rapidly. Observe the outside of the cans. The formation you observe on the first can is called frost. This is parallel to the formation of early morning frost on the ground. Then compare the two temperature readings. You will realize that when the surface of an object (e.g., the ground) is below the freezing temperature of water, the water vapor in the air condenses on the surface as frost. Why did putting salt into the first can make it get colder? I think when people make ice cream at home, they put rock salt into the ice cream maker. That doesn't tell us how it works; just that it does. Maybe you should look into that.

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