Question

Think of air pressure as a column of air. At what altitude do you think air pressure is the highest? _________________

The lowest? ______________

Answer 1

lowest: 30km (and above)

highest: sea level

Step-by-step explanation:

1/ As we are talking about the air, so the lowest altitude is the sea level (Zero mile) - the air pressure P = 1 atm

2/ Since more than half of the atmosphere's molecules are located below an altitude of 5.5km, atmospheric pressure decreases roughly 50% (to around 500mb) within the lowest 5.5km. Above 5.5km, the pressure continues to decrease but at an increasingly slower rate.

And as you can see in the picture attached below, the lowest value of air pressure is reached at the altitude about 30km (about 20miles).