A liquid is any physical substance that will assume the shape of its container, but which has the molecules strongly attracted to each other. You might imagine that the molecules are swimming among their fellow molecules but never leaving them. As the temperature rises, the molecules swim faster and vice versa.
There is another pressure condition that involves liquids. In this illustration, a fluid is contained in a closed space. A piston having a cross-sectional area of one square inch is fitted into a cylinder connected to the container.
The container is completely filled with fluid and a pressure of 100 lbs. is applied to the piston. The pressure gauges indicate that the pressure is transmitted equally in 100 psi (pounds per square inch). This principle is called Pascal’s Law.
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Basics of Refrigeration