The relative density is defined as the ratio between the density of a substance and another substance taken as a reference, resulting ρr
where is the relative density, ρ is the density and the density ρ0 substance.
For liquids and solids, density is the usual reference of liquid water at a pressure of 1 atm and temperature of 4 ° C. Under these conditions, the density of water is 1000 kg/m3, ie 1 kg / L.
For gases, standard reference density of air is the pressure of 1 atm and temperature of 0 ° C.
can also calculate or measure the relative density as the ratio between the weights or masses of identical volumes of the substance and the substance. Franco Andres Rojas
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