Practical Application Firefighters rely on water pressure to fight fires. Real World Examples Pressure can be observed in the Heimlich maneuver, a water saw and a water pick for cleaning your teeth. Exhibit Key Concept Pressure Challenge Yourself Gather a shop vacuum and a beach ball. With the shop vacuum on blower setting, see how far you can push your beach ball across the room. Repeat the previous step but this time add a nozzle to the hose. Notice the distance your beach ball travels with and without the nozzle. When your ears pop while flying in a plane or diving under water that popping feeling is caused by changes in atmospheric pressure. Did You Know ? AT HOME EXPERIMENT