Vapor Density of Gas Formula |
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\( G_{vd} \;=\; \dfrac{ G }{ H }\) (Vapor Density of Gas) \( G \;=\; G_{vd} \cdot H \) \( H \;=\; \dfrac{ G }{ G_{vd} }\) |
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| Symbol | English | Metric |
| \(\large{ G_{vd} }\) = Vapor Density of Gas | \(lbm \;/\; ft^3\) | \(kg \;/\; m^3\) |
| \(\large{ G }\) = Gas Density | \(lbm \;/\; ft^3\) | \(kg \;/\; m^3\) |
| \(\large{ H }\) = Hydrogen Density | \(lbm \;/\; ft^3\) | \(kg \;/\; m^3\) |
Vapor density is a measure of the density of a gas or vapor compared to the density of a reference gas. The reference gas is typically air, which is assigned a vapor density of 1. The vapor density of a gas is useful for various purposes, including determining whether a gas will rise or sink in air. Gases with a vapor density less than 1 are lighter than air and will tend to rise, while gases with a vapor density greater than 1 are heavier than air and will tend to sink.
