Refrigeration & Air Conditioning USCG Question #1020 (Set 21)

Referring to the illustrated psychrometric chart, under what conditions are the dry bulb, wet bulb, and dew point temperatures for air all equal in value? Illustration GS-RA-22 Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration.

Official USCG Answer & Rule Citation

Correct Answer: Option C — When the air is completely saturated with moisture and the relative humidity is 100%.

At 100% relative humidity, air is fully saturated, causing dry-bulb, wet-bulb, and dew-point temperatures to converge at the exact same thermal value on psychrometric charts.

100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.