Density, Specific Weight and Specific Gravity
Specific Gravity of gases is normally calculated with reference to air and defined as the ratio of the density of the gas to the density of the air at a specified temperature and pressure. The Specific Gravity can be calculated as . SG = ρ gas / ρ air [3] where SG = specific gravity of gas ρ gas = density of gas [kg/m 3] ρ air = density of air (normally at NTP [kg/m 3]) NTP ...
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