Wet Bulb Temperature – UPSC Prelims

Wet Bulb Temperature:
  • Wet bulb temperature is the lowest temperature to which air can be cooled by the evaporation of water into the air at a constant pressure.
  • WBT is a limit that considers heat and humidity beyond which humans cannot tolerate high temperatures.
  • A wet-bulb temperature of 31 degrees C is extremely dangerous for humans, while a value of 35 degrees C is unsurvivable for more than about six hours, even for fit and healthy adults resting in the shade.
  • The Wet Bulb temperature is the temperature of adiabatic saturation. This is the temperature indicated by a moistened thermometer bulb exposed to the air flow.
  • Wet Bulb temperature can be measured by using a thermometer with the bulb wrapped in wet muslin.