It is a colorless and flammable gas with a distinctively unpleasant smell. It is a natural substance found in the blood, brain, and feces of animals, and in plant tissues. It also occurs in certain foods, such as some nuts and cheese. It is also known as methanethiol.

**CAS no: **74-93-1

## Properties

#### Generic Properties

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

Chemical Formula | CH4S | - |

Molecular Weight | 48.109 | - |

Heat of Combustion | 23931.2 | kJ/kg |

Boiling Point | 279.11 | K |

Freezing Point | 150.18 | K |

#### Critical Properties

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

Critical Temperature | 469.95 | K |

Critical Pressure | 72.35 | bar |

Critical Volume | 145 | cm3/mol |

Critical Density | 0.3318 | g/cm3 |

Critical Z | 0.268 | - |

Accentric Factor | 0.146 | - |

### Temperature Dependent Properties

#### Specific Heat

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

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

A | 40.307 | 58.29 | -6.063 |

B | -0.0036753 | 0.16072 | 0.75863 |

C | 0.000184 | -0.00048141 | -0.0018296 |

D | -0.000000176 | 1.0701E-06 | - |

E | 5.0137E-11 | - | - |

T min(K) | 100 | 160 | 100 |

T max(K) | 1500 | 375 | 150 |

#### Heat of Formation

The heat of formation can be calculated with the formula:

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

A | 0.48094 |

B | -0.091183 |

C | 0.000045505 |

T min(K) | 388.36 |

T max (K) | 717.75 |

#### Viscosity

The viscosity can be calculated with the formula:

For liquid

For Gas

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

A | -39.38 | -133.23 |

B | 0.467 | 16211 |

C | -0.000062465 | 0.3576 |

D | - | -0.00032031 |

T min(K) | 273 | 293.15 |

T max(K) | 473 | 446.45 |

#### Heat of Vaporization

The heat of vaporization can be calculated with the formula:

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

A | 34.579 |

n | 0.379 |

T min(K) | 150.18 |

T max(K) | 469.95 |

#### Thermal Conductivity

The thermal conductivity can be calculated with the formula:

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

A | -0.0020608 | 0.2512 |

B | 0.000019706 | -0.00020044 |

C | 9.5496E-08 | -4.5151E-07 |

T min(K) | 273 | 180.18 |

T max(K) | 473 | 399.95 |

#### Liquid Density

The Liquid Density can be calculated with the Equation:

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

A | 0.3318 |

B | 0.2802 |

n | 0.2852 |

T min(K) | 150.18 |

T max(K) | 469.95 |

#### Diffusion Coefficient at Infinite Dilution in Water

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

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

A | -1.3553 |

B | -1040.666 |

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 | -0.05536 |

B | 0.00040395 |

C | 8.0345E-07 |

T min(K) | 200 |

T max(K) | 1000 |