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.
Intriguing because of its silver hue and liquid state at room temperature, elemental mercury was known to the ancient Greeks, Romans, Chinese and Hindus. Each civilization had its own legends about mercury, and it was used as everything from a medicine to a talisman.