Density From Specific Gravity Formula
The specific gravity is the density of a substance divided by the density of water. Density is a property of matter and can be defined as the ratio of mass to a unit volume of matter.
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The specific gravity can be calculated as.
Density from specific gravity formula. For example for an api gravity of 50 add 131 5 to obtain 181 5. The formula for specific gravity given that the reference substance is water is the density of the object divided by the density of the water. Add 131 5 to the api gravity.
Pure water 1 density of substance ρ this is the measure of the amount of mass per unit volume of a substance. By steven holzner. The specific gravity formula is defined with water as its reference substance and the formula is the ratio of the density of an object to the density of the water.
ρ density of substance in kgm 3. Sg ρ gas ρ air 3 where sg specific gravity of gas ρ gas density of gas kg m 3. Also the greek symbol rho rho ρ indicate the density.
The density of water at 4 0 c is 1000 kg m 3. In physics a substance s specific gravity is the ratio of that substance s density to the density of water at 4 degrees celsius. It s typically expressed in units of grams per cubic centimeter kilograms per cubic meter or pounds per cubic inch.
ρsubstance sg ρh2o displaystyle rho text substance sg times rho mathrm h 2 o occasionally a reference substance other than water is specified for example air in which case specific gravity means density relative to that reference. The formula for api gravity is api 141 5 sg 131 5 where sg is the specific gravity of the petroleum liquid being measured. Density is expressed by the formula.
The density is derived by dividing the mass of a quantity of substance by its volume. ρ m v where. Density is measured in the units kg m 3.
ρ0 density of pure water 1000 kgm 3 4 c sg specific gravity e g. ρ is the densitym is the massv is the volume. Sg specific gravity unitless ρ substance the density of the substance kg m 3 ρ water the density of water at 4 0 c 1000 kg m 3.
So the specific gravity is a unitless number. Specific gravity of gases is normally calculated with reference to air and defined as the ratio of the density of the gas to the density of the air at a specified temperature and pressure. Because the density of water at 4 degrees celsius is 1 000 kg m 3 that ratio is easy to find for example the density of gold is 19 300 kg m 3 so its specific gravity is the following.
Here we use the greek symbol rho to indicate. The formula looks like this.
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