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Critical Constants: Helium-4
Critical constants (Tc, Pc, Vc, Zc) and acentric factors for pure chemical compounds. Covers 1143 organic and inorganic compounds from Perry and CRC Handbook. Used in equations of state (Peng-Robinson, SRK, van der Waals), corresponding-states correlations, and thermodynamic property estimation.
| compound name | cas number | Pc MPa (MPa) | Tc K (K) | Vc cm3 mol (cm3/mol) | Zc (dimensionless) | acentric factor (dimensionless) | formula | mol weight g mol (g/mol) | name |
|---|---|---|---|---|---|---|---|---|---|
| Helium-4 | 7440-59-7 | 0.2275 | 5.2 | 57.3 | 0.302 | -0.39 | He | 4.003 | Helium-4 |
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