Many people enjoy riding in hot air balloons. Some use them for romantic picnics and marriage proposals. Others race in competitions. Being above the earth gives a whole new perspective on the world around us. As the beginning of a hot air balloon ride, the balloon is flat because the pressure inside the balloon equals the pressure outside. When the air inside the balloon is heated, the speed of movement of those air molecules increases and the pressure goes up. After a while the balloon is completely expanded and the flight is ready to take off.
The carnival worker was almost done setting up. He just needed to inflate the bouncy house. Mark grabbed the pump and attached it to the valve on the side of the bouncy house. He listened as the air swooshed into the house. Soon the house went from flat to fully expanded and was ready for the night.
Are the molecules inside the house moving slower when it was flat or inflated?