Changes

In the ''gravitational method'', a cleaned and dried sample is first weighed and then immersed in a saturating vessel. The vessel is filled with a saturating liquid and pressured to 2000 psi for a minimum of 24 hours. After the pressure stabilizes, the fully saturated sample is removed from the saturator, immediately rolled on an absorbent material to remove the surface film of saturating fluid, and weighed. Pore volume is calculated from the following equation:

In the ''gravitational method'', a cleaned and dried sample is first weighed and then immersed in a saturating vessel. The vessel is filled with a saturating liquid and pressured to 2000 psi for a minimum of 24 hours. After the pressure stabilizes, the fully saturated sample is removed from the saturator, immediately rolled on an absorbent material to remove the surface film of saturating fluid, and weighed. Pore volume is calculated from the following equation:

:<math>V_{\rm p} = (W_{\rm s} - W_{\rm d})/\rho_{\rm s}</math>

:<math>V_{\rm p} = \frac{(W_{\rm s} - W_{\rm d})}{\rho_{\rm s}}</math>

where

where