The average height of a column of mercury (Hg) in a barometer at sea level is
A) 760 mm (76 cm).
B) 1013 inches.
C) something that can not be determined without knowing air temperature.
D) 29.00 millibars.

Question

Quizplus · Accepted Answer

The average height of a column of mercury in a barometer at sea level is 760 mm (or 76 cm). This value is known as standard atmospheric pressure or one atmosphere (1 atm). The other choices are not correct – 1013 inches is too high, air temperature does not affect the height of mercury in the barometer significantly, and 29.00 millibars is equivalent to 720 mm which is lower than the actual value.

The Average Height of a Column of Mercury (Hg) in a Barometer