Wet Bulb Temperature of Air (WBT) - marharyta/apparent-temperature GitHub Wiki

Wet Bulb Temperature of Air (WBT)

The wet bulb temperature of air is such temperature that is measured by the ordinary thermometer with the bulb of it is covered by the wet cloth. When the air comes in contact with the wet cloth it absorbs some moisture and gives up some heat, due to which the temperature of the air reduces.

"If the moisture content of the air is very low, it will give up more heat to the cloth and the wet bulb temperature of air will also be comparatively lower. On the other hand, if the moisture content of air is high it will loose lesser heat to the air and wet bulb temperature will be higher. The more is the moisture or water vapor content of the air more is the wet bulb temperature. Thus the wet bulb temperature indirectly indicates the moisture content present in the air or we can say that it is affected by the relative humidity of the air. The wet bulb temperature of the air is always less than the dry bulb temperature of air. The difference between the DBT and WBT is called as wet bulb depression." (Bright Hub Engineering 2018.)

The Wet Bulb temperature is always between the Dry Bulb temperature and the Dew Point Temperature. (Engineering ToolBox 2004.) The wet bulb temperature of air is such temperature that is measured by the ordinary thermometer with the bulb of it is covered by the wet cloth. When the air comes in contact with the wet cloth it absorbs some moisture and gives up some heat, due to which the temperature of the air reduces.

"If the moisture content of the air is very low, it will give up more heat to the cloth and the wet bulb temperature of air will also be comparatively lower. On the other hand, if the moisture content of air is high it will loose lesser heat to the air and wet bulb temperature will be higher. The more is the moisture or water vapor content of the air more is the wet bulb temperature. Thus the wet bulb temperature indirectly indicates the moisture content present in the air or we can say that it is affected by the relative humidity of the air. The wet bulb temperature of the air is always less than the dry bulb temperature of air. The difference between the DBT and WBT is called as wet bulb depression." (Bright Hub Engineering 2018.)

The Wet Bulb temperature is always between the Dry Bulb temperature and the Dew Point Temperature. (Engineering ToolBox 2004.)

Wet Bulb Temperature can be represented as a function of ambient temperature (Dry Bulb Temperature), denoted as T and relative humidity in % (Stull, R. 2011.):

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