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Glossary of terms: Humidity Measurement Relative Humidity; Unit:% By relative humidity we refer to the ratio of water vapour actually present in the air to the maximum possible mass of water vapour in the air. Since the maximum humidity is dependent on temperature, relative humidity changes with temperature, even when the absolute humidity remains constant. Absolute Humidity; Unit:g/M3 By absolute humidity we refer to the volume of water vapour actually present in a specific quantity of air. Absolute humidity is the ratio of the weight of the water contained in the air and the volume of this moist air. Water Vapour Partial Pressure Saturation Vapour Pressure Unit: hPa By saturation vapour pressure eS(T) we refer to the maximum possible pressure of the water vapour at a certain temperature. The water vapour partial pressure e(t) varies between 0 (dry air) and 30hPa. The saturation vapour pressure determines the upper limit. Saturation humidity, maximum humidity, saturation quantity Unit:g/m3 By maximum humidity hmax, we refer to the maximum possible water vapour quantity in a cubic meter of air at a certain temperature . The moisture absorption capacity of air increases with increasing temperature. If the maximum humidity is exceeded, the excess water vapour condenses in the form of condensate (droplet formation). Dew-Point Unit: °C, °F, °K By dew-point temperature Td, we refer to the temperature at winch the cooling of moist air leads to condensate formulation. This means that when moist air is cooled down to dew-point, the relative humidity rises to 100%. Frost point Unit: °C, °F, °K In some cases where dew-point temperatures are below 0°C, we refer to the frost point temperature. Other descriptions are also dew-point temperature above ice or freezing point. Specific Enthalpy (heat content) Unit: kJ/kg By specific enthalpy Espez, we refer to the quantity of heat necessary to raise the temperature of a gas (or gas mixture) from one temperature to another at a constant pressure. Or; By specific enthalpy we refer to the quantity of heat that is available in the air mass relative to a certain air condition. The enthalpy of unsaturated air is the sum of the enthalpy to vaporise the water content present, plus enthalpy to heat the water vapour mixture to the corresponding temperature. Mixing Ratio Unit: g/Kg
By mixing ratio m, we refer to the ratio of water vapour mass to the mass of dry air.
Wet Bulb Temperature Unit:°C, °F, °K By wet bulb temperature WBT in psychrometric measurement, we refer to the temperature output or indicated by a thermometer probe wrapped in a moist wick.
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