Can someone explain pressure in an aeroplane cabin?

Question

I have physics homework and I have to think of examples of pressure in every day life-such as scuba diving, weather reports, submarines or aeroplanes. Can anyone think of any others? Or give me information on pressure in an aeroplane? I can't find anything on the internet!

Answer 1

Hi, I`m troy Mclure....you might remember me from such answers as NO and Twelve....

when at altitude the air pressure is very low which would make it difficult to breathe so planes are pressurised for passenger comfort.
other examples are water pressure....gas pressure which must be controlled for the safe use of appliances, boilers etc...,
blood pressure...nuff sed ........and many more

Answer 2

Aircraft can have either pressurized or unpressurized cabins and cockpits. Commercial airlines typically pressurize the passenger cabins to around a pressure equivalent to 8,000 ft. altitude. At this pressure, there is sufficient pressure and oxygen that most people can breath normally. However, people with cardio-vascular problems, may find it difficult to breath at the 8,000 ft. pressure level.

Contrary to popular belief, oxygen is not normally pumped into a pressurized cabin. By taking in the thiner outside air at the speed of the aircraft, and by keeping that sucked in air from escaping at the same rate, the pressure inside the cabin is built up to the 8,000 ft. equivalent. And the percentage of oxygen from that compression of the outside air in the cabin is sufficient to sustain life comfortably.

Air pressure on Earth's surface is about 15 lbs per square inch. This means that in one square foot (144 square inches) of area on Earth, there is a force of PA = F = 15 psi X 144 square inches ~ 2160 pounds of atmosphere pushing down. The area of the top of your head is about a third of a square foot; so you typically have about 720 pounds of atmospheric weight (the force) on your pate.

Weather guessers use the fact that the average atmospheric pressure is about 15 psi when guessing about the next day's weather. Over the years, they have found that a falling pressure (the pressure goes from high psi to low psi) portends oncoming storms and such. On the other side, when the pressure rises, that indicates the weather will be nice. In which case we say there is an area of high pressure, which simply means its above the 15 psi average.

A SCUBA diver has that 15 psi pushing on her, plus the weight of the column of water above her. Water, being much denser than air, weighs considerably more than a comparable column of air. So that SCUBA diver has to contend with a lots more pressure the deeper she dives. There is a point in depth where mere SCUBA gear will not work because the diver cannot inhale against the water pressures on her chest. At this point, a diver must don a protective shell, like ALVIN the diving submarine. [See source.]

Astronauts also contend with pressure and require a protective shell. But in this case, the problem is a lack of pressure in space. The human body cannot survive without some pressure...for one thing breathing in does not bring in sufficient oxygen at low pressures (which is why airplace cabins are pressurized to 8,000 ft. or so). So space suits and other environmental shell, like the space station and the shuttle have to be used to keep up the pressure around the astronauts.

Answer 3

Pressurized air is pumped into the cabin from a supercharger on the engine, or from a turbochager or compressor of a turbine engine. it is then cooled by utilising the airconditioning equipment and enters the cabin in the path of the air ducts. various of valves permit the air out of the cabin at a cetain value and this determines how plenty stress is in the cabin. The valve closes for greater stress and opens for much less stress. Cabin stress is expressed in differential stress (evaluating the interior stress to the exterior stress) and cabin altitude (a cabin altitude of 5000 ft is such as status on a 5000 foot mountain. An plane cabin is merely sturdy to a undeniable differential stress, if it climbs bigger, the cabin altitude could climb. Airliners generally have a cabin altitude of 8000 ft and a optimal differential stress of 8.5 PSI.

Answer 4

The higher we go the less is the atmospheric pressure.
The airplanes that usually fly above 20,000 feet require to pressurize their cabin otherwise there would be no air to breath.

Answer 5

air pressure is controlled in the aeroplane cabin, thats y it feels normal