Formic acid is also called methanoic acid and is the simplest carboxylic acid.

**CAS No: **64-18-6

## Properties

#### Generic Properties

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

Chemical Formula | CH2O2 | - |

Molecular Weight | 46.026 | - |

Heat of Combustion | 5099.5 | kJ/kg |

Boiling Point | 373.71 | K |

Freezing Point | 281.55 | K |

#### Critical Properties

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

Critical Temperature | 580 | K |

Critical Pressure | 73.9 | bar |

Critical Volume | 125 | cm3/mol |

Critical Density | 0.3682 | g/cm3 |

Critical Z | 0.192 | - |

Accentric Factor | 0.473 | - |

### Temperature Dependent Properties

#### Specific Heat

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

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

A | 31.745 | -16.11 | -1.69 |

B | 0.0074234 | 0.87229 | 0.41677 |

C | 0.00018791 | -0.0023665 | -0.0006979 |

D | -1.947E-07 | 2.4454E-06 | - |

E | 5.7613E-11 | - | - |

T min(K) | 50 | 283 | 100 |

T max(K) | 1500 | 522 | 275 |

#### Heat of Formation

The heat of formation can be calculated with the formula:

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

A | -371.01 |

B | -0.031111 |

C | 0.000018988 |

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 | -15.488 | -4.2125 |

B | 0.3737 | 979.53 |

C | -0.000062628 | 0.0056 |

D | - | -5.7723E-06 |

T min(K) | 250 | 281 |

T max(K) | 1000 | 580 |

#### Heat of Vaporization

The heat of vaporization can be calculated with the formula:

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

A | 5.5139 |

n | -1.338 |

T min(K) | 281.45 |

T max(K) | 373.71 |

#### Thermal Conductivity

The thermal conductivity can be calculated with the formula:

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

A | -0.0072199 | 0.2663 |

B | 0.000052716 | 0.00021018 |

C | 2.8989E-08 | -6.1017E-07 |

T min(K) | 250 | 282 |

T max(K) | 1000 | 551 |

#### Liquid Density

The Liquid Density can be calculated with the Equation:

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

A | 0.3682 |

B | 0.243 |

n | 0.2366 |

T min(K) | 281.55 |

T max(K) | 580 |

#### Diffusion Coefficient at Infinite Dilution in Water

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

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

A | -0.9145 |

B | -1163.861 |

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 | -0.05114 |

B | 0.00041993 |

C | 8.8798E-07 |

T min(K) | 200 |

T max(K) | 1000 |