If it wasn't pressurised there would be no air and the astronauts would die. Of course they could keep their spacesuits on but that would not be comfortable for an extended period of time.
Mostly not enough oxygen in the air at the low pressure up there.
There is not enough oxygen in the air at altitudes above about 17,000 feet. In addition, as you ascend, the temperature decreases. The temperature in which jet airliners fly often is minus 40 degrees or lower.
Because at altitudes above 10,000 feet there is not enough air for humans to breathe. Aircraft cabins are pressurised so that the internal pressure is equal to that at about 7,000 feet.
Space shuttles and underwater craft both must be air tight, and must carry an air supply with them.
Because in space there is approximately zero absolute pressure, therefore the suit must maintain pressure to allow the astronauts to breath while conducting Extra-Vehicular Activities (EVAs).
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Space suits contain many important gadgets and other things to keep the user alive. Also, they must be pressurized, and be easily movable, with protection from radiation. Besides, in space, they don't weigh anything.
Outside the plane is way less pressure and less air to breath. If inside the plane was the same pressure as the outside, people might die depending on how high the plane is. ***************************************************************************** FAA law mandates an un-pressurized aircraft the pilot and co-pilot must wear oxygen masks at or above 12,000 feet ASL altitude. Hypoxia sets in with no warning and no symptoms.
No. Aerosols must go by ground. They can explode when pressurized.
At the high altitudes which airliners fly in, there is less dense. Since air is good for us humans, the cabin is pressurized in order to provide enough air to breathe.
is a clean recovery container which must have 1000 microns recovery
is a clean recovery container which must have 1000 microns recovery