Using the available references, if the dry bulb temperature is 76° and the wet bulb temperature is 59°, what is the relative humidity in a cargo hold?

Correct Answer: Option A — 35%

Entering standard psychrometric tables with a dry bulb temperature of 76°F and a wet bulb temperature of 59°F yields a depression of 17°F, corresponding directly to a relative humidity of 35 percent in the monitored cargo space atmosphere.