All fluids exert pressure like the air inside a tire. The particles of fluids are constantly moving in all directions at random. As the particles move, they keep bumping into each other and into anything else in their path. These collisions cause pressure, and the pressure is exerted equally in all directions. When particles are crowded together in one part of their container, they quickly spread out to fill their container. They always move from an area of higher pressure to an area of lower pressure. That’s why air entering a tire quickly spreads throughout the tire.
Jane was almost done decorating the yard for her son's birthday. All that was left was to blow up the balloons. She had bought a helium tank so she grabbed a balloon and attached it to the nozzle. As soon as she flipped the tank on she could hear the gas leaving the tank. Soon the balloon was full so she tied it off. Only 19 to go!
where was the air pressure highest?