The mass of water vapor in a given volume of air (i.e., density of water vapor in a given parcel, usually expressed in grams per cubic meter.

Having a pH value less than 7.

The partial pressure exerted by the water vapor present in a parcel. Water in a gaseous state (i.e. water vapor) exerts a pressure just like the atmospheric air. Vapor pressure is also measured in mil [..]

Association of Home Appliance Manufacturers.

Having a pH value greater than 7.

American National Standards Institute.

A BTU is the quantity of heat required to raise 1 pound of water by 1 degree Fahrenheit. This is the standard rating for compressors.

See Expansion Tube.

A dangerous chemical commonly used to keep tap water pure.

The compressors basic function is to pump refrigerant throughout its closed loop of pipes and tubes. Compressors are rated in BTUs or tons. 1 Ton = 12,000 BTU.