Can you keep a piece of paper dry if submerged in water? The power of air can! Crumple a piece of paper into a ball, wedge it tight inside of a cup, turn the cup upside down, and submerge it straight down into a pool of water. Lift the cup straight up, the paper remains dry! This is a great experiment to teach kids about air pressure and also when introducing gas as one of the states of matter. Even though we can't see air, it's there!