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refrigerant +   
A substance used in a thermodynamic heat pump cycle or refrigeration cycle that undergoes a phase change from a gas to a liquid and back. Refrigerants are used in air-conditioning systems and freezers or refrigerators and are assigned a 'R' number (by ASHRAE - formerly the American Society of Heating, Refrigerating and Air Conditioning Engineers), which is determined systematically according to their molecular structure.
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Synonyms
Related Synonyms: refrigerants
Xrefs: Wikipedia:Refrigerant

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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.