# Methane - Prandtl number

## Figures and table showing changes in Prandtl number for methane with changes in temperature and pressure

**The Prandtl Number** - Pr - is a *dimensionless number* approximating the ratio of *momentum diffusivity* (kinematic viscosity) to *thermal diffusivity* - and is often used in heat transfer and free and forced convection calculations.

The Prandtl number can for calculations be expressed as

Pr = μ C

_{p}/ k (1)where

μ = absolute or dynamic viscosity (kg/m s, lb_{m}/(ft h))

C_{p}= specific heat (J/kg K, Btu/(lb_{m}^{o}F))

k = thermal conductivity (W/m K, Btu/(h ft^{2}^{o}F/ft))

Below, Prandtl numbers for **methane** at varying temperatures and pressures are given in figures and table.

See also** methane: **Thermophysical properties, and Density and Specific Weight and Thermal conductivity at varying temperature and pressure, as well as **Prandtl number** of air, ammonia, carbon dioxide and water.** **** **

Methane Prandtl number at atmospheric pressure, temperature given as °C or °F:

Methane Prandtl number at varying temperatures and constant pressures, SI and Imperial units:

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Methane Prandtl number at given temperatures and 1, 10 and 100 bara presure:

Temperature | Prandtl number at given pressures | ||||

[K] | [°C] | [°F] | 1 bara,14.5 psia |
| 100 bara,1450 psia |

160 | -113 | -172 | 0.7721 | 0.8659 | 1.629 |

180 | -93.2 | -136 | 0.7583 | 0.8170 | 1.640 |

200 | -73.2 | -99.7 | 0.7487 | 0.7892 | 1.867 |

220 | -53.2 | -63.7 | 0.7420 | 0.7726 | 2.055 |

240 | -33.2 | -27.7 | 0.7369 | 0.7607 | 1.453 |

260 | -13.2 | 8.3 | 0.7328 | 0.7515 | 1.148 |

280 | 6.9 | 44.3 | 0.7299 | 0.7452 | 1.007 |

300 | 26.9 | 80.3 | 0.7279 | 0.7402 | 0.9304 |

320 | 46.9 | 116 | 0.7261 | 0.7370 | 0.8824 |

340 | 66.9 | 152 | 0.7243 | 0.7341 | 0.8501 |

360 | 86.9 | 188 | 0.7234 | 0.7312 | 0.8269 |

400 | 127 | 260 | 0.7216 | 0.7276 | 0.7968 |

500 | 227 | 440 | 0.7182 | 0.7233 | 0.7560 |

600 | 327 | 620 | 0.7155 | 0.7179 | 0.7385 |

700 | 427 | 800 | 0.7127 | ||

800 | 527 | 980 | 0.7099 | ||

900 | 627 | 1160 | 0.7082 | ||

1000 | 727 | 1340 | 0.7060 |

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