What is the atmospheric pressure in the troposphere?
The troposphere is the lowest layer of the earth’s atmosphere and is the one that contains weather and which can support life. Its upper limit is the highest point that the suns heat can cause warm and moist air to reach. This means that the troposphere extends to a much higher altitude in the tropics than near the cooler poles – between 15km (9 miles) to 8km (5 miles). Atmospheric pressure varies from around 1000 kpa (14 pounds per square inch, PSI) at sea level down to about 200 kpa (3psi) at about 10km.
