Except in special aircraft, the hold of an aircraft is usually not pressurized, and the pressure is the same as the atmospheric pressure outside the aircraft The passenger compartment, as I recall, is usually pressurized to about 6 to 8 thousand feet.
The highest altitude is 8,000 ft. But depending on the aircraft, it is usually pressurized to around 6,500 to 7,000 ft.
Because the pilots, staff and passengers would pass out from lack of oxygen at the altitudes that aircraft fly best. Aircraft cabins are usually pressurized to 8,000 feet altitude equivalent. This also reduces passenger inner-ear discomfort.
Air craft cabin is fully pressurized.
The SW-3 refers to the Swearingen Merlin (also called the Fairchild Aerospace Merlin). It is a pressurized turboprop twin engine business aircraft.
Only specialized aircraft fly in space - airplanes are not pressurized or shielded the way rockets and the space shuttle are, so they can't go into space.
To allow passengers to breathe sufficient oxygen, needed to survive, even in high altitudes.
Jet or rocket powered, with a pressurized cabin.
At 35,000 feet, a human would suffer severe oxygen starvation without a pressurized cabin. Also known as "death". A pressurized cabin in a commercial - or military - airliner is essential at high altitude.
At altitudes above 10,000 feet there is not enough air for humans to breathe. Aircraft cabins are pressurized so the pressure is equal to that at about 7,000 feet. Commercial airliners fly at altitudes up to 40,000 feet.
Generally yes. Few large commercial airplanes travel under 10,000 feet where you need oxygen or pressurization.
For two reasons: 1. To make the air breathable and comfortable. 2. In conjunction with the above, to keep the temperature at a safe level.