Question

Air pressure is measured by a barometer. One type of barometer utilizes an evacuated, calibrated tube inverted in a pool of mercury that is open to the atmosphere. As air pressure increases, the mercury will rise in the column until the weight of the mercury in the column equals the force exerted by the air on the surface of the pool.

The barometer shown here (Figure 1) measures atmospheric pressure in millimeters of mercury (mmHg ). According to this barometer, what is the atmospheric pressure P in inches of mercury (inHg )?

Express your answer in inches of mercury using five significant figures.

At a pressure of 917 mbar , what would the height of the mercury in the column of a mercury barometer?

Answer 1

A atmospheric pressure -R60mm of tt 6 cm of tWe knouw that 1,n ch = 2.54 cm 2 S4 tm inth ,:4 atmosphere pesuve p- 6cm x 2.S4 T6 inch of Hg 2SH 29.921 2 S98 th of Hig .0132S 03 17 mbar = 687.8 mm of