The refrigerant flows through the coils on the back or under the freezer and through an expansion valve to the inside of the freezer. As the refrigerant passes through the expansion valve the pressure drops and hence the temperature also drops.
The noun MM has 1 sense: 1  1. a metric unit of length equal to one thousandth of a meter. 2  Meaning: 3  A metric unit of length equal to one thousandth of a meter. 4  Classified under: 5  Nouns denoting quantities and units of measure. 6  Synonyms: 7  millimeter; millimetre; mm. 8  Hypernyms (mm is a kind of...):
MMcfd - Million cubic feet per day (used with natural gas) MMS - Minerals Management Service, division of US Department of the Interior; MMT - Million metric tons; MOU - Memorandum of Understanding; MPE - maximum probable earthquake; MRC - Maximum Reservoir Contact; MS - Mail Station; MV - megavolt ; MVA - megavolt-amperes ; MVAR - megavolt-ampere reactive