Vapor Density of Chloride is defined as the the density of a particular gas or vapor of chloride relative to that of hydrogen at the same pressure and temperature. And is denoted by V.D.. Vapor Density of Chloride is usually measured using the Gram for Weight. Note that the value of Vapor Density of Chloride is always negative. Typically, the value of Vapor Density of Chloride is greater than 0.