# Redlich–Kwong equation of state calculator

Calculate pressure/volume/temperature, compressibility factor, and fugacity coefficient for liquid/gas/fluid.
Warning: may return a value for a metastable state.

Usage:
• Enter the critical temperature and pressure.
• Enter two of three quantities, leave blank the field which is to be calculated.
• Select units.
• Click Calculate to get the missing quantity, compressibility factor, and fugacity coefficient.
• Expressions (e.g., 200/132) are accepted in input fields.

 Critical temperature = Temperature = °C K Critical pressure = Pressure = Pa kPa bar atm MPa Molar volume = m³/mol dm³/mol cm³/mol

Results:
 gas: n.a. liquid: n.a.

Notation:
T = temperature
P = pressure
Vm = molar volume
Tc = critical temperature
Pc = critical pressure
reduced quantities: Tr=T/Tc, Pr=P/Pc, Vr=Vm/(R*Tc/Pc)
Z = Pr*Vr/Tr= P*Vm/(R*T) = compressibility factor
φ = fugacity coefficient
atm = 101325 Pa

Author:
© Jiří Kolafa (2006, 2020) by the GNU General Public License 3