What does popping bubble wrap have to do with science? Actually, it demonstrates an important scientific law, called Boyle’s law. Like other laws in science, this law describes what always happens under certain conditions. Boyle’s law is one of three well-known gas laws, which state the relationships among temperature, volume, and pressure of gases. (The other two gas laws are Charles’ law and Amontons’ law.) According to Boyle’s law , if the temperature of a gas is held constant, then decreasing the volume of the gas increases its pressure—and vice versa. That’s what happens when you squeeze the bubbles of bubble wrap. You decrease the bubbles' volume, so the air pressure inside the bubbles increases until they pop.
Mark was know for playing practical jokes on all his friends. But this time they got him. They were all supposed to meet at their favorite restaurant but he was running late. He hurried in and slid into his seat. As he sat down he heard a loud noise. The unmistakable sound of air leaving a  whoopee cushion
After Mark sat were the air molecules moving or stationary inside the whoopee cushion?