Whereas, relative humidity (RH), in simple terms, is a measurement of how much water vapor ... The below scenario helps explain this phenomenon: The included diagram is a psychometric chart used in ...

In both cases, we say that the relative humidity is 50% ... Looking at the sponge diagram, the dew point represents the temperature if the dry part of the sponges (yellow areas) were removed.

PITTSBURGH (KDKA) — Oftentimes in weathercasts, you'll hear KDKA-TV's First Alert meteorologists mention the relative humidity and dew point, but what are these two terms and what do they mean?