How do you calculate specific gravity with temperature?
Calculate the object’s specific gravity by dividing its density by the density of water at 4 degrees Celsius. It follows that pure water has a specific gravity of 1 or close to 1 depending on temperature.
How do you convert molecular weight to specific gravity?
S = M / Mair , where S=gas specific gravity, M=gas molecular weight, Mair=28.96443 g/mole (molecular weight of standard air – CRC, 1983). The gas specific gravity calculation does not check for unreasonable inputs.
Does specific gravity change with temperature?
Being a ratio of densities, specific gravity is a dimensionless quantity. Specific gravity varies with temperature and pressure; reference and sample must be compared at the same temperature and pressure or be corrected to a standard reference temperature and pressure.
How do you calculate an API degree?
The formula for API gravity is API = (141.5/SG) -131.5 where SG is the specific gravity of the petroleum liquid being measured. For example, for an API gravity of 50, add 131.5 to obtain 181.5.
What is the specific weight of water at 20 degrees Celsius?
998.23 kg/m^3
It is exactly 1000 kg/m^3 at 4 degrees Celsius. At 20 degrees Celsius it is 998.23 kg/m^3 ( or 0.99823 g/cm^3).
Does molecular weight change with temperature and pressure?
Well, molar mass is a constant and independent of temperature and pressure….
Does specific weight change with temperature?
Can temperature affect specific gravity? Yes, it can. When using water as a reference for establishing specific gravity, it is almost always assumed that the water is at 4°C, when it’s densest. In cases where the temperature or pressures of the two substances differ, the discrepancy must be corrected.
Why does specific gravity decrease with temperature?
Because of differences in intermolecular interactions, the density of the substance can change at different rates compared to the density of water, which is why the specific gravity also changes with changing temperature and pressure.
What is the relationship between API and specific gravity?
API gravity is thus an inverse measure of a petroleum liquid’s density relative to that of water (also known as specific gravity). It is used to compare densities of petroleum liquids. For example, if one petroleum liquid is less dense than another, it has a greater API gravity.