Question

how does air pressure change when an airplane takes off?​

Answer 1

Explanation:

• As a flight climbs after takeoff, the air pressure in the cabin decreases. As a result, the cabin air expands by about 30%. When the flight descends to land, the volume of the air contracts again.

Answer 2

Answer:

The wings have an “aerofoil” shape, and the upper surface causes the air that passes over the top to go a greater distance than the air that passes below.

This creates a lower pressure above the wing, and a greater pressure below the wing.

Thus the wing is lifted upwards.

This principle is Bernoulli’s principle and one such web article on this is Bernoulli's Principle and Airplane Aerodynamics

The airflow has to reach a minimum speed, this is why it takes time before the plane lifts off the ground: the airflow speed needs to be established before the aircraft’s control surface (wings, tail, rudder) can become effective. Once this speed has been established, the pilot can when pull back on the stick, thus the tail can raise the nose but actually it’s to increase the angle of attack of the wings against the airflow, and the lift force increases. The plane is then lifted from the runway. The pilot must be careful to control this angle of attack because beyond a certain angle the airflow is no longer smooth and the lift effect is lost. This is a “stall” - it’s where the wings can no longer fly.