# 7.6.12.17.6. From_Density

Syntax

  Mass Fraction [{of} SpeciesName] = From_Density ()

Scope

  Aria Material

Summary

  Defines mass fraction from species density and overall density

Description

  Defines the mass fraction for species as

  where is the overall `DENSITY` expression for the current phase, and is the `DENSITY` for species in the current phase.

Parameter | Value | Default
--- | --- | ---
{of} | {of | species | subindex} | –
SpeciesName | string | –