Relative humidity. Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature. Relative humidity depends on temperature and the pressure of the system of interest. It requires less water vapor to attain high relative humidity at low temperatures; more water vapour is required to attain high relative humidity in warm or hot air.
silver is the color of the element mercury silver is the color of the element mercury Silvery.
1 The modern element symbol for mercury is Hg, which is the symbol for another name for mercury: hydrargyrum. 2  Hydrargyrum comes from Greek words for water-silver (hydr-means water, argyros means silver). 3  Mercury is a very rare element in the Earth's crust. 4  It accounts for only about only 0.08 parts per million (ppm). Mercury is a very rare element in the Earth's crust. 2  It accounts for only about only 0.08 parts per million (ppm). 3  Mercury generally is not allowed on aircraft because it combines so readily with aluminum, a metal that is common on aircraft.