1–24C

1–24C What is specific gravity? How is it related to density?
ANS
1-24CThe specific gravity, or relative density, and isdefined as the ratioof the densityof a substance to
the densityof somestandard substance ata specified temperature (usually water at 4°C, for which ρH2O=
1000 kg/m
3
). That is,  SG H2O /ρ ρ = .  When specific gravityisknown, densityisdetermined from
H2O SG ρ ρ × = .