# Graphic mean size

## Description

For a particle size distribution, the graphic mean size can be estimated from the percentages of the particles corresponding to the 16%, 50% and 84%

Related formulas## Variables

M_{z} | Graphic mean size (ϕ) |

ϕ16 | Particle's percentage which corresponds to 16% phi unit (ϕ) |

ϕ50 | Particle's percentage which corresponds to 50% phi unit (ϕ) |

ϕ84 | Particle's percentage which corresponds to 84% phi unit (ϕ) |