#refrigerant  a substance used to provide cooling (as in a refrigerator)
  supertype:  #substance__matter  that which has mass and occupies space; "an atom is the smallest indivisible unit of matter"
  subtype:  #cryogen  a liquid that boils at below -160 C and is used as a refrigerant
     subtype:  #liquid_nitrogen  nitrogen in a liquid state
     subtype:  #liquid_air  air in a liquid state

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