Absolute humidity

It is a measure of the actual amount of water vapor present in the air, regardless of the temperature or air pressure. It is typically expressed in grams of water vapor per cubic meter of air (g/m³) or grains of water vapor per pound of dry air (gr/lb). 

Compression Ratio

Ratio between Absolute discharge pressure to the Absolute suction Pressure.

Cooling

The process of removing thermal energy from the space for the purpose of reducing or maintaing space temperature.

Dehumidifying

The process to remove moisture content from the air in space for the purpose of reducing moisture content of air. 

Equilibrium Moisture Content (EMC)

A term used to describe the moisture content at which a hygroscopic material, such as wood, reaches a balance with the relative humidity and temperature of the surrounding environment. At this point, the material neither gains nor loses moisture.

Heating

The process of adding thermal energy to the space for the purpose of raising and maintening temperature of space. 

Humidifying

The process to add moisture content to the air in space for the purpose of increasing or maintenaining the moisture content of the air. 

Moisute content

Moisture content is water vapour weight that each pound of air contains.

Vapor Diffusion

The process of moisture movement through a barrier due to differences in vapor pressure. It occurs when there is a difference in vapor pressure between two sides of a barrier, causing water molecules to move from the area of higher vapor pressure to the area of lower vapor pressure.

Vapor Pressure

The force exerted by a gas or vapor in equilibrium with its solid or liquid phase. It is directly related to the concentration of water molecules in the air.

Relative Humidity (RH)

The ratio of the amount of water vapor in the air to the maximum amount of water vapor the air can hold at a given temperature, expressed as a percentage.

Specific Volume

It is substance's volume per weight.

 Specific Humidity

It is the actual amount of moisture that is found withing 1 pound of air.