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.
Planets have the colors that they have because of what they are made of and how their surfaces or atmospheres reflect and absorb sunlight. Mercury has a dark gray, rocky surface which is covered with a thick layer of dust.The surface is thought to be made up of igneous silicate rocks and dust.1  Javascript must be enabled to use Cool Cosmos.2  Learn how.ercury has a dark gray, rocky surface which is covered with a thick layer of dust. The surface is thought to be made up of igneous silicate rocks and dust. 1  Javascript must be enabled to use Cool Cosmos. 2  Learn how.