# 7.6.12.13.1. Air_Water

Syntax

  Mass Diffusivity [{of} SpeciesName] = Air_Water [Tortuosity = tortuosity | P_Ref = p_ref | D_Ref = d_ref | Exponent = exponent]

Scope

  Aria Material

Summary

  Air/Water mass diffusivity

Parameter | Value | Default
--- | --- | ---
{of} | {of | species | subindex} | –
SpeciesName | string | –
tortuosity | real | –
p_ref | real | –
d_ref | real | –
exponent | real | –