This page provides supplementary chemical data on methane.
Material Safety Data Sheet
The handling of this chemical may incur notable safety precautions. It is highly recommend that you seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions.
Structure and properties
Thermodynamic properties
| Phase behavior |
| Triple point |
90.67 K (−182.48 °C), 0.117 bar |
| Critical point |
190.6 K (−82.6 °C), 46 bar |
Std enthalpy change
of fusion, ΔfusHo |
1.1 kJ/mol |
Std entropy change
of fusion, ΔfusSo |
? J/(mol·K) |
Std enthalpy change
of vaporization, ΔvapHo |
8.17 kJ/mol |
Std entropy change
of vaporization, ΔvapSo |
? J/(mol·K) |
| Solid properties |
Std enthalpy change
of formation, ΔfHosolid |
? kJ/mol |
Standard molar entropy,
Sosolid |
? J/(mol K) |
| Heat capacity, cp |
? J/(mol K) |
| Liquid properties |
Std enthalpy change
of formation, ΔfHoliquid |
? kJ/mol |
Standard molar entropy,
Soliquid |
? J/(mol K) |
| Heat capacity, cp |
? J/(mol K) |
| Gas properties |
Std enthalpy change
of formation, ΔfHogas |
−74.87 kJ/mol |
Standard molar entropy,
Sogas |
188 J/(mol K) |
Enthalpy of combustion ΔcHo |
–882.0 kJ/mol |
| Heat capacity, cp |
35.69 J/(mol K) |
| van der Waals' constants[1] |
a = 228.29 L2 kPa/mol2
b = 0.04278 liter per mole |
Vapor pressure of liquid
| P in mm Hg |
1 |
10 |
40 |
100 |
400 |
760 |
1520 |
3800 |
7600 |
15200 |
30400 |
45600 |
| T in °C |
–205.9(s) |
–195.5(s) |
–187.7(s) |
–181.4 |
–168.8 |
–161.5 |
–152.3 |
–138.3 |
–124.8 |
–108.5 |
–86.3 |
— |
Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. Annotation "(s)" indicates equilibrium temperature of vapor over solid. Otherwise temperature is equilibrium of vapor over liquid.
log10 of methane vapor pressure vs. temperature. Uses formula:  given in Lange's Handbook of Chemistry, 10th ed. Note that formula loses accuracy near T crit = −82.6°C
Spectral data
Methane infrared spectrum
References
- ^ Lange's Handbook of Chemistry, 10th ed, pp 1522-1524
Except where noted otherwise, data relate to standard ambient temperature and pressure.
Disclaimer applies.
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