Gas Compressibility Factor

Calculate gas compressibility factor or Z factor.

The compressibility factor is used to account for the non ideal behaviour of real gases. The non ideal gas law is expressed as

` P V = Z Ro T `

where :

P = gas pressure `
`T = gas temperature `
`V = gas mole volume `
`Z = gas compressibility factor `
`Ro = universal gas constant

The compressibility factor canbe calculated using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals cubic equations of state (EOS), or using the virial equation.

Change Module :

Gas Compressibility Factor From The Cubic Equation Calculation Module
Gas Compressibility Factor From The Virial Equation Calculation Module
All

Related Modules :

Fluid Compressibility Factor Data Module
Fluid Critical Point And Molar Mass Data Module
Fluid Mixture From Kay's Rule Calculation Module
More Fluid Compressibility Z Factor Modules

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Links : ±

CALCULATOR : Methane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate methane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 0.678 kg/m³
Z Factor at critical point 191 K 4.6 MPa ≈ 0.288
Vapour pressure at boiling point 112 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Ethane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate ethane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.28 kg/m³
Z Factor at critical point 305 K 4.9 MPa ≈ 0.284
Vapour pressure at boiling point 185 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Ethene Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate ethene or ethylene gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.18 kg/m³
Z Factor at critical point 282 K 5.0 MPa ≈ 0.277
Vapour pressure at boiling point 169 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Propane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate propane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.91 kg/m³
Z Factor at critical point 370 K 4.2 MPa ≈ 0.280
Vapour pressure at boiling point 231 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Propene Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate propene or propylene gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.81 kg/m³
Z Factor at critical point 365 K 4.6 MPa ≈ 0.275
Vapour pressure at boiling point 225 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Butane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate butane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 2.52 kg/m³
Z Factor at critical point 425 K 3.8 MPa ≈ 0.274
Vapour pressure at boiling point 273 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Isobutane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate isobutane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 2.51 kg/m³
Z Factor at critical point 408 K 3.6 MPa ≈ 0.282
Vapour pressure at boiling point 261 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Pentane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate pentane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at critical point 470 K 3.4 MPa ≈ 0.231 kg/m³
Z Factor at critical point 470 K 3.4 MPa ≈ 0.269
Vapour pressure at boiling point 309 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Isopentane Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate isopentane gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at critical point 460 K 3.4 MPa ≈ 0.236 kg/m³
Z Factor at critical point 460 K 3.4 MPa ≈ 0.270
Vapour pressure at boiling point 301 K ≈ 101 kPa

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Ammonia Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate ammonia gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 0.73 kg/m³
Z Factor at critical point 406 K 11.3 MPa ≈ 0.242
Vapour pressure at boiling point 240 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Carbon Dioxide Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate carbon dioxide gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.87 kg/m³
Z Factor at critical point 304 K 7.4 MPa ≈ 0.468
Vapour pressure at boiling point 195 K ≈ 101 kPa

Note : The boiling point temperature for carbon dioxide is lower than the melting point temperature.

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Nitrogen Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate nitrogen gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at 288.15 K 101.325 kPa ≈ 1.19 kg/m³
Z Factor at critical point 126 K 3.3 MPa ≈ 0.311
Vapour pressure at boiling point 77 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Water Vapour Compressibility Factor Density And Vapour Pressure (Yaws) [FREE] ±

Calculate water vapour gas molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at critical point 647 K 22.1 MPa ≈ 0.322 kg/m³
Z Factor at critical point 647 K 22.1 MPa ≈ 0.229
Vapour pressure at boiling point 373 K ≈ 101 kPa

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
presstype : Fluid Pressure Type
- Pu : User Defined Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
P : Fluid Pressure
Pr : Reduced Pressure
Pv : Vapour Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Air Compressibility Factor And Density (Yaws) [FREE] ±

Calculate air molar volume, compressibility factor Z, density and vapour pressure from critical point constants using the Peng Robinson, Soave, Redlich Kwong and Van Der Waals equations of state (EOS).

Check the calculator against the following values:

Density at critical point 132 K 3.8 MPa ≈ 310 kg/m³
Z Factor at critical point 132 K 3.8 MPa ≈ 0.320
Density at 288.15 K 101.325 kPa ≈ 1.23 kg/m³

Reference : McGraw Hill : Yaws : Chemical Properties Handbook

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
P : Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
M : Gas Molar Mass
Pr : Reduced Pressure
SG : Gas Specific Gravity Relative To Air
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check

CALCULATOR : Gas Compressibility Factor And Density From Cubic Equation Of State [FREE] ±

Calculate gas molar volume, compressibility factor Z and density from the fluid pressure, temperature and critical point constants for selected gases.

The compressibility factor can be calculated from either the Peng Robinson, Soave, Redlich Kwong, or van der Waals equation of state (EOS). The compressibility factor calculation is valid for gas phase only. Use the Result Plot option to plot compressibility factor versus pressure and temperature, compressibility factor versus pressure and equation of state type, or compressibility factor versus temperature and equation of state type.

Tool Input

fluidtype : Fluid Type
- SGu : User Defined Gas Specific Gravity
- ωu : User Defined Acentric Factor
- Pcu : User Defined Critical Pressure
- Tcu : User Defined Critical Temperature
eostype : Equation Of State
- Zu : User Defined Compressibility Factor
P : Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Fluid Density
ω : Accentric Factor
Pc : Critical Point Pressure
Pr : Reduced Pressure
SG : Gas Specific Gravity Relative To Air
Tc : Critical Point Temperature
Tr : Reduced Temperature
Vm : Molar Volume
Z : Compressibility Factor
cvg : Convergence Check
mw : Fluid Molar Mass

CALCULATOR : Fluid Mixture Compressibility Factor And Density From Cubic Equation [FREE] ±

Calculate gas molar volume, compressibility factor Z and density for a gas mixture.

The pseudo critical constants are calculated using Kay's rule (the pressure is calculated from the temperature, mole volume and compressibility factor using the ideal gas equation). The compressibility factor can be calculated using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals equations. The mole fraction of the first component is adjusted so that the sum of the mole fractions equals one.

Tool Input

eostype : Equation Of State
- Zu : User Defined Compressibility Factor
X : Mole Fraction Data
mwx : Molar Mass Data
Tcx : Critical Temperature Data
Vcx : Critical Mole Volume Data
Zcx : Critical Compressibility Factor Data
ωx : Accentric Factor Data
P : Fluid Pressure
T : Fluid Temperature

Tool Output

ρ : Mixture Density
ω : Mixture Accentric Factor
Pc : Mixture Pseudo Critical Pressure
Pr : Mixture Reduced Pressure
SG : Gas Specific Gravity Relative To Air
Tc : Mixture Pseudo Critical Temperature
Tr : Mixture Reduced Temperature
Vc : Mixture Critical Mole Volume
Vm : Mixture Mole Volume
Z : Mixture Compressibility Factor
Zc : Mixture Critical Compressibility Factor
cvg : Convergence Check
mw : Mixture Molar Mass

CALCULATOR : Fluid Compressibility Factor From Reduced Pressure And Temperature [FREE] ±

Calculate gas compressibility factor Z from the reduced pressure and temperature, and either the Redlich Kwong, or van der Waals equation of state (EOS).

The reduced pressure is equal to the fluid pressure divided by the critical pressure. The reduced temperature is equal to the fluid temperature divided by the critical temperature. Use the Result Plot option to display the compressibility factor versus reduced pressure and temperature.

Tool Input

eostype : Equation Of State
ω : Accentric Factor
Pr : Reduced Pressure
Tr : Reduced Temperature

Tool Output

Z : Compressibility Factor
cvg : Convergence Check