Formaldehyde is a naturally occurring organic compound and it is a pungent, colorless gas.

**CAS No: **50-0-0

## Properties

#### Generic Properties

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

Chemical Formula | CH2O | - |

Molecular Weight | 30.026 | - |

Heat of Combustion | 17541.3 | kJ/kg |

Boiling Point | 254.05 | K |

Freezing Point | 181.15 | K |

Flash Point | 219.8166667 | K |

Auto Ignition | 703.15 | K |

LEL | 7 | vol % |

UEL | 73 | vol % |

#### Critical Properties

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

Critical Temperature | 408 | K |

Critical Pressure | 65.86 | bar |

Critical Volume | 105 | cm3/mol |

Critical Density | 0.286 | g/cm3 |

Critical Z | 0.204 | - |

Accentric Factor | 0.282 | - |

### Temperature Dependent Properties

#### Specific Heat

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

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

A | 34.428 | 44.222 | 1 |

B | -0.029779 | 0.39859 | 0.39333 |

C | 0.00015104 | -0.0015358 | - |

D | -1.273E-07 | 3.0329E-06 | - |

E | 3.3887E-11 | - | - |

T min(K) | 50 | 191 | 75 |

T max(K) | 1500 | 331 | 180 |

#### Heat of Formation

The heat of formation can be calculated with the formula:

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

A | -102.61 |

B | -0.022577 |

C | 8.3638E-06 |

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 | -4.0407 | -370.52 |

B | 0.368 | 41434 |

C | -0.000058748 | 1.0953 |

D | - | -0.0010793 |

T min(K) | 250 | 293.15 |

T max(K) | 1000 | 387.6 |

#### Saturation Pressure

Saturation pressure can be calculated with the formula:

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

A | 7.46432 |

B | 1078.39 |

C | 254.377 |

T min(C) | -92 |

T max(C) | 134.85 |

#### Heat of Vaporization

The heat of vaporization can be calculated with the formula:

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

A | 30.94 |

n | 0.297 |

T min(K) | 181.15 |

T max(K) | 408 |

#### Thermal Conductivity

The thermal conductivity can be calculated with the formula:

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

A | -0.00377 | 0.3208 |

B | 0.000054728 | -0.0002391 |

C | 3.3983E-08 | -8.9012E-07 |

T min(K) | 250 | 211.15 |

T max(K) | 1000 | 338 |

#### Liquid Density

The Liquid Density can be calculated with the Equation:

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

A | 0.2619 |

B | 0.2224 |

n | 0.2857 |

T min(K) | 181.15 |

T max(K) | 408 |

#### Diffusion Coefficient at Infinite Dilution in Water

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

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

A | -1.2827 |

B | -1031.08 |

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 | -0.05944 |

B | 0.00052368 |

C | 1.0253E-06 |

T min(K) | 200 |

T max(K) | 1000 |