A. 117 mm Hg B. 877 mm Hg C. 643 mm Hg D. 760 mm Hg A. 117 mm Hg B. 877 mm Hg C.

Question

A. 117 mm Hg

B. 877 mm Hg

C. 643 mm Hg

D. 760 mm Hg

A. 117 mm Hg

B. 877 mm Hg

C. 643 mm Hg

D. 760 mm Hg

Flying in a plane or diving beneath the ocean's surface change the surrounding pressure, which can result in physiological complications. Barotrauma refers to a general class of pressure-related tissue injury; barodontalgia is a painful toothache sometimes reported by SCUBA divers and military pilots. A manometer in a lab is open to the atmosphere; the pressure of the gas in the flask can be calculated by the difference in the mercury levels in the arms of the U-shaped tube. If the atmospheric pressure is equal to 760 torr, calculate the pressure in the flask shown in Figure 2 below. Atmosphere 760 torr Flask mm

Explanation / Answer

The correct answer is B.

The calculation is as follows:

The pressure in the flask is given by:

Pgas = Patm + h

Given the atmospheric pressure is equal to 760 torr

= 760 torr + 117 mm

Conversion of torr to mm hg to add the above two values

760 torr = 759.99 mm Hg

Pgas = (759.99 + 117) mm Hg = 877 mm Hg

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