3A. Physical Constants                                                                                                                               Back to Main

Compound is a substance composed of two or more elements united chemically in definite proportions.

Molecular weight is the mass of the collection of atoms represented by the chemical formula for a molecule.

Compressibility Factor () is a measure of the deviation of the actual relation from the ideal-gas equation state (PV = nRT).

Critical temperature () is the highest temperature at which it is possible to convert the gaseous form of a substance to a liquid. The critical temperature increases with an increase in the magnitude of intermolecular force. This value is given in both R – Rankin and K - Kelvin.

Critical pressure () is the pressure at which a gas at it is critical temperature is converted to a liquid state. This value is given in both psia and MPa.

The Eykman (EMR) is a parameter related to the refractive index and molecular weight of a fluid. The values are found from the molecular weight and the specific gravity of the heaviest fraction shown in analysis.

The Acentric Factor (w ) was developed by Pitzer to describe the deviation of a fluid from the simple fluid behavior, or its nonconformity with the corresponding states principle.

 

Methane

Ethane

Propane

iso –Butane

 

n – Butane

 

iso – Pentane

 

n – Pentane

 

n – Hexane

 

n – Heptane

 

n - Octane

 

n – Nonane

 

n – Decane

 

Nitrogen

 

Carbon Dioxide

 

Hydrogen Sulfide

 

Oxygen

 

Hydrogen

 

Water

 

Back to Main