specific gravity is density compared to water (1000kg/m^3) which is 1so for example : steel @ 7850 kg/m^3 , specific gravity = 7850/1000 = 7.85
The density of aluminum at room temperature is 2,70 g/cm3.
More or less. Specific gravity is the density of a substance, compared to the density of water - so the units may vary.
water
Hydrogen monoxide.