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.
It's all about static electricity! Lightning happens when the negative charges (electrons) in the bottom of the cloud (and your finger) are attracted to the positive charges (protons) in the ground (and the pie pan). The resulting spark is like a mini-bolt of lightning.