σ is defined as the ratio of mass density of a fluid to some standard mass density. For solids and liquids this standard mass density is the maximum mass density for water (which occurs at 4°C) at atmospheric pressure.
Relative Density
σ is defined as the ratio of mass density of a fluid to some standard mass density. For solids and liquids this standard mass density is the maximum mass density for water (which occurs at 4°C) at atmospheric pressure.
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