Changes

===Pore volume measurement===

===Pore volume measurement===

[[file:porosity_fig5.png|thumb|{{figure number|5}}Schematic diagram of a Boyle's law helium poroslmeter for pore volume measurement.]]

[[file:porosity_fig5.png|thumb|300px|{{figure number|5}}Schematic diagram of a Boyle's law helium poroslmeter for pore volume measurement.]]

Pore volume can be measured directly by resaturating a clean, dry rock with a fluid. Resaturation is done with either gas (Boyle's law method) or liquid (gravitational method).

Pore volume can be measured directly by resaturating a clean, dry rock with a fluid. Resaturation is done with either gas (Boyle's law method) or liquid (gravitational method).