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Rating Newest Oldest. Best Answer: The can gets cold for the same reason that any other refrigeration unit gets cold. (eg air conditioner, refrigerator, dehumidifier). Inside of the can, there is a chemical which can be used as a refrigerant. It's a chemical with a low vapor pressure. When you press the button on top of the can, you open a valve and release some of the pressure from the can.
Gases can be compressed because there is so much space between molecules. Diffusion: Diffusion is movement from an area of high concentration to an area of low concentration. Gases are in constant motion, so it follows that if you have an area of high concentration, the gas will move to the area of low concentration. You can see this work when you open a container of compressed gas.