### 1.3.3. Multiplying Sources by Porosity

Selecting the Multiply by Porosity check box causes the equation source to be scaled by the porosity value. For example, if a porous domain has a volume porosity of 0.8 and the Multiply by Porosity check box is selected, 80% of the source is applied to the fluid; if the check box is not selected, then 100% of the source is applied to the fluid.

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