write the relative density of dry air ????
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The relative density of gases is often measured with respect to dry air at a temperature of 20 °C and a pressure of 101.325 kPa
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Relative density, or specific gravity,[1][2] is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, air at room temperature (20 °C or 68 °F) is the reference. The term "relative density" is often preferred in scientific usage. It is defined as a ratio of density of particular substance with that of water.
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