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...):
What does the mm mean? All lenses have an âmmâ number printed on them somewhere. The short definition of mm is âfocal length,â which is measured in millimeters. Some lenses have a range of focal lengths, such as 18mm to 55mm, while others have a single, âfixedâ focal length.