Question

The kilopascal is a unit of measure for atmospheric pressure. Suppose the atmospheric air pressure at sea level is about 104 kilopascals. For every​ 1000-m increase in​ altitude, the pressure decreases about 11.9​%. What is the approximate pressure at an altitude of 2000 ​m? The pressure at an altitude of 2000 m is about ___ kilopascals.

Answer 1

For this case what we must do is find the pressure for each 1000 meters of height.

For the first 1000 meters we have:

$(1-0.119) * 104 = 91.624 kPa$

Then, for 2000 meters of height we have:

$(1-0.119) * 91.624 = 80.72 kPa$

Answer:

The pressure at an altitude of 2000 m is about 80.72 kilopascals.