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A refrigerant is the working fluid used in refrigeration and air-conditioning systems to absorb heat from a low temperature region and reject it to a high temperature region during the refrigeration cycle. The selection of a suitable refrigerant is very important for the efficient, safe and economical operation of refrigeration systems. A good refrigerant should possess several desirable thermodynamic, physical, chemical and environmental properties. One of the most important properties of a good refrigerant is a low boiling point. The refrigerant should be able to evaporate at a temperature lower than the temperature of the space or substance that needs to be cooled. This allows the refrigerant to absorb ________ _________ _____ ____ _____ _______.
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