Methane is a chemical compound with the formula CH4. It is the first element of the alkane hydrocarbon family and is the main constituent of natural gas. The relative abundance of methane on Earth makes it an attractive fuel, although capturing and storing it poses challenges due to its gaseous state under normal conditions for temperature and pressure.

**CAS no: **74-82-8

## Properties

#### Generic Properties

Property | Value | Unit |
---|---|---|

Chemical Formula | CH4 | - |

Molecular Weight | 16.043 | - |

Heat of Combustion | 50028.8 | kJ/kg |

Boiling Point | 111.66 | K |

Freezing Point | 90.67 | K |

Flash Point | 85.37 | K |

Auto Ignition | 873.15 | K |

LEL | 5 | vol % |

UEL | 15 | vol % |

#### Critical Properties

Property | Value | Unit |
---|---|---|

Critical Temperature | 190.58 | K |

Critical Pressure | 46.04 | bar |

Critical Volume | 99.3 | cm3/mol |

Critical Density | 0.1616 | g/cm3 |

Critical Z | 0.288 | - |

Accentric Factor | 0.011 | - |

### Temperature Dependent Properties

#### Specific Heat

The specific heat at constant pressure can be calculated with the formula:

Constant | Gas | Liquid | Solid |
---|---|---|---|

A | 34.942 | -0.018 | 5.27 |

B | -0.039957 | 1.1982 | 0.71386 |

C | 0.00019184 | -0.0098722 | -0.0032653 |

D | -0.000000153 | 0.00003167 | - |

E | 3.9321E-11 | - | - |

T max(K) | 50 | 92 | 21 |

1500 | 172 | 90 |

#### Heat of Formation

The heat of formation can be calculated with the formula:

Constant | Value |
---|---|

A | -63.383 |

B | -0.042512 |

C | 0.000017525 |

T min(K) | 298.15 |

T max (K) | 1000 |

#### Viscosity

The viscosity can be calculated with the formula:

For liquid

For Gas

Constant | Gas | Liquid |
---|---|---|

A | 3.8435 | -7.3801 |

B | 0.4011 | 319.25 |

C | -0.00014303 | 0.0479 |

D | - | -0.0001412 |

T min(K) | 91 | 91 |

T max(K) | 850 | 191 |

#### Heat of Vaporization

The heat of vaporization can be calculated with the formula:

Constant | Value |
---|---|

A | 10.312 |

n | 0.265 |

T min(K) | 90.67 |

T max(K) | 190.58 |

#### Thermal Conductivity

The thermal conductivity can be calculated with the formula:

Constant | Gas | Liquid |
---|---|---|

A | -0.00935 | 0.2269 |

B | 0.00014028 | 0.00044275 |

C | 3.318E-08 | -5.2397E-06 |

T min(K) | 97 | 91 |

T max(K) | 1400 | 181 |

#### Liquid Density

The Liquid Density can be calculated with the Equation:

Constant | Value |
---|---|

A | 0.16 |

B | 0.2881 |

n | 0.277 |

T min(K) | 90.67 |

T max(K) | 190.58 |

#### Saturation Pressure

The Saturation Pressure can be calculated with the Antoine Equation:

Constant | Value |
---|---|

A | 6.84566 |

B | 435.621 |

C | 271.361 |

T min(C) | 90.67 |

T max(C) | 190.58 |

#### Diffusion Coefficient at Infinite Dilution in Water

The Diffusion Coefficient at Infinite Dilution in Water can be calculation:

Constant | Value |
---|---|

A | -1.6865 |

B | -920.576 |

T Min(K) | 274 |

T Max(K) | 394 |

#### Diffusion Coefficient in Air

The Diffusion Coefficient in Air can be calculated with the Equation:

Constant | Value |
---|---|

A | -0.09564 |

B | 0.00069948 |

C | 1.2497E-06 |

T min(K) | 200 |

T max(K) | 1000 |