What is the specific gravity (SG) of nitrogen dioxide (NO2)?

The specific gravity (SG) of a gas like nitrogen dioxide (NO2) is a measure that compares the density of the gas to that of air, which has a specific gravity of approximately 1. The formula for specific gravity is the density of the substance divided by the density of air at the same temperature and pressure.

For nitrogen dioxide, its molecular weight is about 46 grams per mole. Given that the average molecular weight of air is approximately 29 grams per mole, this ratio results in a specific gravity of about 1.589. This indicates that nitrogen dioxide is heavier than air, as indicated by its specific gravity being greater than 1.

In summary, the specific gravity of nitrogen dioxide is determined through its molecular characteristics and density comparison to air, leading to a value of 1.589, confirming it as heavier than air.