Barometer

Problem
Assuming specific weight of air to be constant at 12 N/m³, what is the approximate height of Mt. Banahaw if a mercury barometer at the base of the mountain reads 654 mm and at the same time another mercury barometer at the top of the mountain reads 480 mm.

Problem
A barometer reads 760 mm Hg and a pressure gage attached to a tank of oil (s = 0.8) reads 850 cm. What is the absolute pressure in the tank in kilogram per square centimeter?