# Determine the atmospheric pressure at the top of the mountain if the pressure at its foot is 740 mm.

Determine the atmospheric pressure at the top of the mountain if the pressure at its foot is 740 mm. and the height of the mountain is 3150 m.

Ascending approximately every 10.5 m, atmospheric pressure decreases by 1 mm Hg.
Let’s find how many mm Hg. the atmospheric pressure decreased when climbing to an altitude of 3150 m:
10.5 m = 1 mm Hg;
3150 m = h.
By proportion:
x = 3150 * 1 / 10.5 = 300 mm Hg.
The atmospheric pressure at the top of the mountain will be equal to the difference in atmospheric pressure at the foot of the mountain and 2300 mm Hg:
740 – 300 = 440 (mm Hg).
Answer: the atmospheric pressure at the top of a mountain with a height of 3150 m is equal to 440 mm Hg.

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