Explain the reason gases apply pressure.

Mount fuji is approximately 12389 ft above sea level. The standard hike up the mountain starts at 6600 ft. The atmospheric pressure at different altitudes can be approximated using the following equation P = e^{−h / 7000} where P is in atmospheres and h is in meters. Determine the atmospheric pressure in mmHg at the start of the hike.

A sample of gas is held inside a cylinder equipped with a movable piston that has an area of 0.720 m². If a mass of 8.42 kg is pushing down on the piston, Calculate the pressure exerted on the gas in pounds per square inch.

Determine the pressures (in mmHg) of the enclosed gas in (A), (B), and (C) if the atmospheric pressure is 735 mmHg. Assume that the gray liquid is mercury.

The density of cyclohexylbenzene, a nonvolatile liquid, is 0.9427 g/mL. If the atmospheric pressure is 700.0 mmHg, predict the height (in m) of liquid in a barometer containing cyclohexylbenzene. (ρ_Hg = 13.60 g/mL)