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air pressure
Air pressure may refer to:
Trivia about air pressure
About 14.5 pounds per square inch at sea level, it decreases with altitude & has to be increased in airplanes
(Kelly and Sarah of the Clue Crew hold a deflated weather balloon; Kelly reads the clue.) Weather balloons are released twice a day at the National Weather Service; they can rise up to 100,000 feet, where a decrease in this will make the 6-foot balloon expand to 20 feet in diameter
(Jon of the Clue Crew performs an experiment.) In the egg-in-a-bottle experiment, the flame going out causes a vacuum effect, so the egg is sucked in by the differential in this between the inside & outside of the bottle
(Kelly of the Clue Crew plays with beakers.) In a force-and-movement experiment, the reason the water doesn't fall out of the cup is because this force pushing up against the card is greater than the weight of the water
A helicopter can fly because its blades are curved to create differential in this above & below them