Using the available references, if the dry bulb temperature is 58° and the wet bulb temperature is 53°, what is the relative humidity in a cargo hold?

Correct Answer: Option D — 72%

Entering psychrometric tables with a dry bulb temperature of 58°F and a wet bulb temperature of 53°F yields a wet bulb depression of 5°F, which cross-references to a relative humidity of 72 percent within the ventilated cargo compartment.