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The wet bulb temperature is measured with

  • A.a thermometer held at the dew point of the air
  • B.a thermometer with a wetted wick in moving air
  • C.a thermometer immersed in the process liquid
  • D.a thermometer shielded from all air movement

Answer: B

Evaporation from the wick cools the bulb until the heat arriving by convection balances the latent heat leaving. Adequate air velocity over the wick is essential or the reading is wrong. A sling psychrometer supplies that movement by swinging.

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