Vapour Pressure Modules

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

Calculate IAPWS R7-97 saturated vapour pressure and temperature.

The saturation point can be calculated from either the saturation temperature, or the saturation pressure.

Steam properties can be calculated for saturated liquid, saturated vapour, and mixed saturated liquid and vapour from quality factor. The enthalpy and internal energy are calculated from the mass. Use the Result Plot option to plot the steam pressure and steam properties versus temperature.

Note : There is an anomaly in the steam calculation for region 3 between the saturated vapour line, the region 2/3 boundary, and the critical pressure. Refer to the region 3 anomaly help page for more details (click the utility button on the data bar). IAPWS R7-97 is intended for industrial use, and is a simplified version of IAPWS R6-95 for scientific use. IAPWS R7-97 was developed as an improvement of the IFC-67 model.

Reference : IAPWS R7-97 Industrial Formulation for thermodynamic Properties of Water and Steam

Change Module :

• IAPWS R7-97 Fresh Water Density At Atmospheric Pressure Calculation Module
• IAPWS R7-97 Steam Adiabatic Constant Enthalpy Calculation Module
• IAPWS R7-97 Steam Boiler Feed Pump Power Calculation Module
• IAPWS R7-97 Steam Boiler Power Calculation Module
• IAPWS R7-97 Steam Condenser Power Calculation Module
• IAPWS R7-97 Steam Critical Flow Calculation Module
• IAPWS R7-97 Steam Isentropic Constant Entropy Calculation Module
• IAPWS R7-97 Steam Isentropic Efficiency Calculation Module
• IAPWS R7-97 Steam Isoenergetic Constant Internal Energy Calculation Module
• IAPWS R7-97 Steam Nozzle Calculation Module
• IAPWS R7-97 Steam Quality Calculation Module
• IAPWS R7-97 Steam Table Calculation Module
• IAPWS R7-97 Steam Turbine Power Calculation Module
• IAPWS R7-97 Steam Volume And Mass Calculation Module
• IAPWS R7-97 Steam Volume And Mass Flow Rate Calculation Module
• IAPWS R7-97 Steam Work Or Heat Power Calculation Module
• All
• More Steam Modules

Fluid density and specific gravity data.

For gases, the specific gravity is generally measured relative to air. For liquids, the specific gravity is generally measured relative to water.

Related Modules :

• Fluid Compressibility Factor Data Module
• Fluid Critical Point And Molar Mass Data Module
• Fluid Density And Volume Calculation Module
• Fluid Dynamic And Kinematic Viscosity Data Module
• Fluid Specific Heat Capacity Data Module
• Fluid Surface Tension Data Module
• Fluid Thermal Expansion Coefficient Data Module
• Fluid Vapour Pressure Data Module
• Methane Gas And Liquid Data Module
• Yaws Critical Point And Accentric Factor Data Module
• More Fluid Density Modules