the amount of heat a given quantity of refrigerant will absorb in changing from a liquid to a vapor at a given evaporating pressure.

instantaneous evaporation of some liquid refrigerant at the metering device due to pressure drop, which cools the remaining liquid refrigerant to, desired evaporation temperature.

the lowest possible temperature, where all molecular activity theoretically ceases. -456.69°F or -273.15°C.

the temperature at which the removal of any heat will begin a change of state from a vapor to a liquid.

air, which contains no moisture vapor.

an atmosphere which tends to promote the oxidation of immersed materials.

a concentrated attack by oxygen or other corrosive chemicals in a boiler, producing a localized depression in the metal surface.

a device, such as a filter, to retain solid particles allowing a liquid to pass.

a stem is a rod or similar piece spanning the inside and the outside of the valve, transmitting motion to control the internal disc or rotor from outside the valve. Inside the valve, the rod is joined to or contacts the disc/rotor. Outside the valve the stem is attached to a handle or another controlling device. Between inside and outside, the stem [..]

a synonym for steam, usually used to denote steam of low absolute pressure.