What temperature associated with the psychrometric properties of air is measured with a sling psychrometer?

Correct Answer: Option A — The wet bulb temperature

A sling psychrometer utilizes two thermometers: one dry bulb and one wetted wick. As air passes over the wet wick, evaporation cools the bulb. This temperature depression, compared against the dry bulb, allows for the calculation of relative humidity and dew point based on psychrometric principles used in HVAC systems.