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BenedictWebbRubin PVT Formula and Calculator
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BenedictWebbRubin PVT Formula and Calculator
BenedictWebbRubin (BWR) equation of state, is often the most convenient way of representing the PVT surface of a fluid and of calculating its thermodynamic properties.
The fact that many of the derived thermodynamic properties can be calculated explicitly in closed, analytic form greatly enhances the usefulness of the equation and the speed of machine calculations. This characteristic of the equation also allows it to be fit to several properties simultaneously (e.g., density and specific heat). Such multiproperty fitting virtually assures the accuracy of most derived thermodynamic properties, provided sufficient good data are available.
Related (Basic, Free Membership required):
Modified BenedictWebbRubin equation of state for gaseous and liquid oxygen
Application of the BenedictWebbRubin to State of Argon
Preview: BenedictWebbRubin Calculator
Eq. 1
P = R · T · ρ + ( ( B · R · T  A  C / T^{2} ) · (ρ^{2} ) ) + (ρ^{3} ) ( b · R · T  a ) + a · α · (ρ^{6}) + ( c · ρ^{3} / T^{2} ) · ( 1 + γ · (ρ^{2} ) ) exp ( ( 1 ) · γ · (ρ^{2}))
Where:
R = Gas Constant (BTU/mol psi K)
T = Temperature (K)
ρ = Density (g/cc)
A = Correlation Constant (dimensionless)
B = Correlation Constant
(dimensionless)
C = Correlation Constant (dimensionless)
a = Correlation
Constant (dimensionless)
b = Correlation Constant (dimensionless)
c =
Correlation Constant (dimensionless)
α = Correlation Constant (dimensionless)
γ = Correlation Constant
(dimensionless)
P = Pressure (psi)
Source:
John M. Campbell, Gas Conditioning and Processing, Campbell Petroleum Series, Oklahoma, 1992, Vol. 1, Page: 48.
Related:
 Van der Waals Constants for Gases
 Ideal Gas Properties of Oxygen O2 (SI Units), Entropies at 0.1 MPa (1 Bar) Pressure, Mass Basis
 Thermodynamic Properties of Ammonia for Temperatures 0 to 40 °C Specific Volume, m3/kg and Internal Energy, kJ/kg
 Superheated Nitrogen Thermodynamic Properties Table, Specific Volume, m3/kg, Internal Energy, kJ/kg, Enthalpy, kJ/kg, and Entropy, kJ/kgK at pressure 400 kPa, 600 kPas, 800 kPa, and 1000 kPa.
 Effects of Pressure Changes on Fluid Properties
 Saturated and Superheated Vapors

Ideal Gas Assumptions, Properties of Pure Substances, Property Tables, Class
2