Using the available references, if the dry bulb temperature is 80°F (27°C) and the wet bulb temperature is 70°F (21°C), what is the relative humidity in a cargo hold?

Correct Answer: Option C — 61%

Entering standard psychrometric tables or dew point and relative humidity charts with a dry bulb temperature of 80 degrees Fahrenheit and a wet bulb temperature of 70 degrees Fahrenheit yields a relative humidity value of 61 percent.