Friday, October 5, 2007




Cup or bowl with ice
Rock salt
Graph paper
Thermometer that reads Fahrenheit and Centigrade degrees


1. Place ice in cup, or bowl, and read the temperature. Record.
2. Sprinkle 1-2 tablespoons of rock salt on the ice. Start timing.
3. Read and record temperature every 30 seconds for 3 minutes (see the chart on the following pages.)
4. Try different bowls. Does the type of bowl (size, metal or plastic) change your answers? Change the amount of salt you added. Does this change your answer?
5. Graph your results with temperature as the ‘y’ axis, and time as the ‘x’ axis.
Have your parents help.


After addition of the rock salt, you will notice the temperature decreasing. This is why you add rock salt to the ice in an ice cream machine; it makes it colder which in turn makes it easier for ice cream to form.

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