We all know how dangerous electricity can be if it's misused or handled improperly. Today's talk isn't about electricity, although it touches upon some knowledge about electricity, more specifically static electricity. Static electricity occurs when electrons are moved about on a surface, like when you comb your hair. The friction of the comb moving across hair creates static electricity. You can see it, although if you comb your hair in the dark, you might see some sparks.
Static electricity can cause sparks.
Sparks that can ignite flammable liquid, when the vapor of the liquid is such that it can be ignited. Almost any movement can create static electricity. Liquid moving through a pipe or hose creates static electricity. What is happening is the liquid is moving different electrons from one to another. When the conditions are right, you create static electricity by walking on a carpet.