# Fourier number ( thermal )

## Description

The Fourier number (Fo) or Fourier modulus, is a dimensionless number that characterizes heat conduction. it is the ratio of diffusive/conductive transport rate by the quantity storage rate and arises from non-dimensionalization of the heat equation. The transported quantity is usually either heat or matter (particles).

Related formulas## Variables

Fo_{h} | Fourier number (dimensionless) |

α | The thermal diffusivity (m^{2}/s) |

t | The characteristic time (s) |

L | The length through which conduction occurs (m) |