Related to variance: standard deviation, variance analysis Variance The discrepancy between what a party to a lawsuit alleges will be proved in pleadings and what the party actually proves at trial.
Figure 2: Friction, pressure, and. separation are the major causes of. industrial static electricity. A charged insulator can remain charged for many hours. Opposite. polarity charges can exist on an insulator at the same time. Charges will not migrate on insulators.
[citation needed] Rubbing glass with fur, or a plastic comb through the hair, can build up triboelectricity. Most everyday static electricity is triboelectric. The polarity and strength of the charges produced differ according to the materials, surface roughness, temperature, strain, and other properties.