Wet Bulb Dry Bulb Thermometer

Air humidity can be estimated by measuring. At lower humidity the wet bulb temperature is lower than dry bulb temperature because of evaporative cooling. At 100 relative humidity the wet bulb temperature is equal to the air temperature dry bulb temperature.

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Temperature of the ordinary air measured by the thermometer when it is covered by wet cloth or wick is called as the wet bulb temperature commonly referred to as wbt.

Wet bulb dry bulb thermometer.

The temperature of the air measured by the ordinary thermometer is called as the dry bulb temperature of air commonly referred as dbt. Dry bulb temperature t db can be measured with a simple thermometer as shown above. The wet bulb temperature is always lower than the dry bulb temperature but will be identical with 100 relative humidity the air is at the saturation line. By definition wet bulb temperature is the lowest temperature a portion of air can acquire by evaporative cooling only.

Wet bulb temperature t wb can be measured with a standard thermometer with some wet clothing cotton or similar around the bulb. The wet bulb temperature wbt is the temperature read by a thermometer covered in water soaked cloth wet bulb thermometer over which air is passed. Dry bulb temperature and. It includes a dry bulb thermometer a wet bulb thermometer and a psychrometric chart a graph that plots the relationships between the dry and wet bulb temperature relative humidity and dew point at constant pressure.

The dry bulb temperature is basically the temperature of the air but the wet bulb temperature is affected by the evaporation of water from the fabric enclosing the bulb. Note that continuously air flow around the thermometer is important to evaporate. The dbt and wbt of the air are measured by a special thermometer called sling thermometer. Wet bulb temperature can be measured by using a thermometer with the bulb wrapped in wet muslin.

Combining the dry bulb and wet bulb temperature in a psychrometric diagram or mollier chart gives the state of the humid air. The adiabatic evaporation of water from the thermometer bulb and the cooling effect is indicated by a wet bulb temperature lower than the dry bulb temperature in the air. The wet bulb temperature is the adiabatic saturation temperature. The concept behind a wet bulb thermometer is simple but keep in mind that to measure relative humidity it has to be used in conjunction with a dry bulb thermometer.

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