The troposphere is the lowest part of the atmosphere. In this region, most of our weather occurs. Its height varies greatly based on latitude and season, and it can be as high as twenty kilometres (12 miles) above the equator or as low as seven kilometres (4 miles) above the poles during winter. According to the International Society of Atmospheric Physics (ISA), the Troposphere ends at an altitude of 11,000 metres (36,089ft).
Commercial and military aircraft fly in the troposphere because it offers low air resistance and good lift capacity. These properties allow for smoother flights, which is good for efficiency and speed. Airborne airplanes are not suited for flying in the stratosphere due to their lack of pressurized cabins.
Aeroplanes typically fly in the troposphere, which is 11 km above sea level. Other parts of the atmosphere include the Mesosphere and the Exosphere. These three layers are the foundation of our world and are the places where all of our biodiversity lives. Birds, butterflies, and even some fish live. In addition to the diverse range of life, they also play an important role in aviation and meteorological phenomena.
The troposphere is the lower part of the atmosphere and is ideal for flying lighter aircraft. Heavier aircraft, however, prefer flying higher. The troposphere is subject to cloud formation, thunderstorms, and water vapour. Further up, the exosphere is the highest part of the gaseous envelope, and the air is more similar to a vacuum.