What is the atmospheric pressure at the top of a 210m hill if it is 758mm at the bottom?

Since the change in atmospheric pressure by 1 millimeter of mercury occurs with an increase in height by 10 meters, the pressure difference at the foot and at the top of the hill will be:

210/10 = 21 mm Hg

Thus, the pressure at the top of the hill will be:

758 – 21 = 737 mm Hg

Answer: At atmospheric pressure above sea level equal to 758 mm Hg. on the top of a hill 210 meters high, the pressure will be 737 mm Hg.