Calculate pressure/volume/temperature, compressibility factor, and fugacity coefficient for liquid/gas/supercritical fluid.

- Enter the critical temperature and pressure.
- Enter two of three quantities leaving blank the field to be calculated.
- Select units.
- Click Calculate to get the missing quantity, compressibility factor, and fugacity coefficient.
- Stability is reported for gas and liquid. Supercritical and unstable phases are referred to as “fluid”.
- Simple expressions (e.g., 200/132) are accepted in input fields.
- Spaces, tabs etc. are not allowed in input fields.
- The decimal separator is period(.), not comma(,).

**Results:**

fluid: | n.a. | |

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

1 atm = 101 325 Pa, 1 bar = 100 000 Pa

Theory (in Czech) – Critical data of selected gases – Version 1 (with reduced quantites) – Version 2 (no stability detection)

**Author:**

© Jiří Kolafa (2006–2023) by the GNU General Public License 3