Given a dry bulb temperature of 78°F and wet bulb temperature of 66.5°F, the dew point is __________.

Correct Answer: Option C — 59.0°F

Psychrometric tables utilize dry bulb and wet bulb temperatures to determine atmospheric moisture properties. Entering standard tables with a dry bulb of 78°F and wet bulb of 66.5°F yields a dew point of 59.0°F, critical for preventing cargo sweat.