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.
The word color is used in the different sentences as different parts of speech. The word color can be used both as a noun as well as an adjective. 'Mercury is the color red' should properly be one of the following: Mercury's color is red. Mercury is of the color red. Mercury is red colored. Mercury is colored red.