It needs to be cooled in the condenser, which is mounted on the back of the refrigerator, so its contents can be cooled by the ambient air. Once the compressor has done its work, the gas should be under high pressure and hot. You can sense the heat increase in the pump while you pump and compress the air. As mentioned earlier, the compressor provides a similar effect to that of a bike pump. To keep a refrigerator running, you need to be able to get the gaseous refrigerant back to its liquid state, so the gas needs to be compressed to a higher pressure and temperature again. When you release the contents into the lower pressure open space, it turns from a liquid to a gas. The contents of an aerosol can is the pressure/liquid side, the outlet is the capillary tube, and the open space is the evaporator. The effect is similar to what happens when you use an aerosol product such as hair spray. To start the evaporation process and change the refrigerant from liquid to gas, the pressure on the refrigerant needs to be reduced through an outlet called the capillary tube. As it evaporates, you should feel a chilling sensation - the same basic principle gives us safe food storage. You can test this process for yourself by taking some alcohol and putting a drop or two on your skin. This process, called evaporation, cools the surrounding area and produces the desired effect. Refrigerators work by causing the refrigerant circulating inside them to change from a liquid into a gas.
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