Question

airplanes have pressurised cabins for passenger safety while flying high in the atmosphere. Give reason

Answer 1

Airplanes are pressurized because the air is very thin at the altitude they fly. The average passenger jet has a cruising altitude of about 30,000 to 40,000 feet. Atthis altitude humans can't breathe very well and our body gets less.

Answer 2

Because you would pass out at cruising altitude if they weren't, due to the low partial pressure of oxygen at high altitudes.