One of the main reasons is to conserve fuel. Airplanes can fly at any altitude and speed. However, airplanes generally tend to fly at high altitude to conserve fuel. This makes the plane more efficient and keeps the operating cost down. Of course, an airplane can not always fly at max altitude at every flight. It may have too much weight or the distance it travels may be too short. So there is always a trade-off as to how they will fly the route.
ailerons bank (turn) an airplane left or right. the only change in altitude. the elevators (witch are located on the rear of a plane) changes your altitude
36,000 feet
From 28,000 to 33,000 feet.
Speed, altitude, and cost.
less oxegen levels and air pressure.
The highest altitude is 8,000 ft. But depending on the aircraft, it is usually pressurized to around 6,500 to 7,000 ft.
The change in pressure is highly affected by altitude.
Because the air gets thinner with more altitude, and at some point the thin air can no longer give enough lift for airplanes to stay aloft.
Increased altitude means decreased air pressure.
At cruising altitude most airplanes are at between 35,000 and 41,000 feet. However, to get there it has to pass all of the intervening feet between that and the altitude of the airport.
The rate of change of air pressure as a function of increasing altitude decreases with increasing altitude.
The melting point of a substance does change with altitude. All due to atmospheric pressure, makes different elements behave differently.