Using the available references, if the dry bulb temperature is 84° and the wet bulb temperature is 81°, what is the relative humidity in a cargo hold?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 88%
Entering psychrometric reference tables with a dry bulb temperature of 84 degrees Fahrenheit and a wet bulb temperature of 81 degrees Fahrenheit results in a relative humidity value of 88 percent for the ventilated compartment.
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