### Formula

phi

porosity

VT

the bulk volume of the sample

Vv

the effective volume of the pores

phi

porosity

VT

the bulk volume of the sample

Vv

the effective volume of the pores

Measuring porosity by gas expansion method: A sample of known bulk volume is enclosed in a container of known volume. It is connected to another container with a known volume which is evacuated (i.e., near vacuum pressure). When a valve connecting the two containers is opened, gas passes from the first container to the second until a uniform pressure distribution is attained.

VT

Vv

phi

Precision

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