The dc voltage per unit thickness, applied across two electrodes in contact with a specimen, divided by the current per unit area passing through the system.
NOTE 1 Volume resistivity is generally expressed in ohm-centimeters.
NOTE 2 When concentric ring electrodes are used as described in ASTM-D991, volume resistivity is calculated by using the following equation:
volume resistivity (rv) = π × (D1)2 × R/4T
D1 = diameter of inner electrode or disk;
R = measured resistance in ohms;
T = thickness of specimen.
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