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The wet-bulb temperature is the lowest temperature that may be achieved by evaporative cooling of a water-wetted, ventilated surface.. By contrast, the dew point is the temperature to which the ambient air must be cooled to reach 100% relative humidity assuming there is no further evaporation into the air; it is the temperature where condensation (dew) and clouds would form.
The wet-bulb globe temperature (WBGT) is a measure of environmental heat as it affects humans. Unlike a simple temperature measurement, WBGT accounts for all four major environmental heat factors: air temperature, humidity, radiant heat (from sunlight or sources such as furnaces), and air movement (wind or ventilation). [ 1 ]
‘Wet-bulb temperature’ refers to temperatures taken with a thermometer covered in a wet cloth, which are normally slightly cooler than ‘dry-bulb’ temperatures.
The AT is defined as the temperature, at the reference humidity level, producing the same amount of discomfort as that experienced under the current ambient temperature and humidity. [6] The formula [7] is: = +, where: T a is dry-bulb temperature (°C)
As the planet continues to get hotter, humans are at greater risk for heat-related illness and death but an index aims to avoid such.
Wet bulb globe temperature is a better indicator of the risk posed by outdoor conditions than either heat index or temperature, experts say.
Dry/Wet-bulb temperature; The dew point is the temperature the air needs to be cooled to (at constant pressure) in order to produce a relative humidity of 100%. [1]
An ongoing heat wave in India and Pakistan and rising wet-bulb temperatures could create hot and severely humid conditions that threaten human survivability.