Explore: Relative Humidity

(86 °F) Three primary measurements of humidity are widely employed: absolute, relative, and specific. Absolute humidity is the mass of water vapor per volume

at high temperatures. Thus a change in the temperature changes the relative humidity. A prototype hygrometer was invented by Leonardo da Vinci in 1480

temperature and relative humidity, in shaded areas, to posit a human-perceived equivalent temperature, as how hot it would feel if the humidity were some other

The critical relative humidity (CRH) of a salt is defined as the relative humidity of the surrounding atmosphere (at a certain temperature) at which the

temperature the air is cooled to at constant pressure in order to produce a relative humidity of 100%. This temperature is a thermodynamic property that depends

derived from the dew point rather than the relative humidity, though both dew point and relative humidity (when used in conjunction with air temperature)

is impregnated such that it will change color when the indicated relative humidity (RH) is exceeded. This has usually been a blotting paper impregnated

as the temperature of a parcel of air cooled to saturation (100% relative humidity) by the evaporation of water into it, with the latent heat supplied

and humidity as the barometric pressure is fairly stable. Using the capacitance change, along with the measured temperature, the relative humidity can

illustration) during the day, then inward, closing it at night, as the relative humidity shifts in response to the daily temperature change. Bracts are scarious