A large difference in temperature between a wet bulb and a dry bulb on a sling psychrometer indicates
A) that the air is cooling by adiabatic expansion.
B) that the relative humidity is high.
C) that substantial evaporation is occurring from the wet bulb.

Question

Quizplus · Accepted Answer

A large difference in temperature between a wet bulb and a dry bulb on a sling psychrometer indicates substantial evaporation is occurring from the wet bulb. This is because the wet bulb measures the temperature after the effect of evaporative cooling, whereas the dry bulb measures the actual air temperature. The greater the difference between the two temperatures, the more evaporation is occurring, which indicates lower relative humidity.

A Large Difference in Temperature Between a Wet Bulb and a Dry