A clean and dry sandstone core (bulk volume = 3.46 cm^3) is placed in a Boyle\'s

Question

A clean and dry sandstone core (bulk volume = 3.46 cm^3) is placed in a Boyle's Law Porosimeter as shown below: Then, the value connecting chamber 1 to chamber 2 is opened allowing the air in chamber 1 to expand into chamber 2. the final pressure of the system is 20.0 psia as shown below: Use Boyles Law to find the porosity of the core. Assume the volume of the tubing connecting both chambers is negligible. Which porosity (absolute or effective) is measured by the gas compression/expansion method or Boyle's law porosimeter? Explain

Explanation / Answer

To find grain volume:
(37)(18)=(20)(36-x)
33.3=36-x
x=2.7
Bulk Volume of a Rock = Grain Volume + Pore Volume
Vb = Vg + Vp
3.46 cm3= 2.7 + Pv
0.76=Pv
P1 V1 = P2 V2         where V2 = Vp+ V1   
(37)(18)=(20)V2
V2=33.3

33.3 = Vp + 18
15.3 = Vp

effective because gas fills only the interconnected pore of the rock

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