M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

Simple mercury barometers were historically particularly useful because the high density of mercury allows a barometer to be only approximately 1 m tall to measure normal fluctuations in atmospheric pressure, which determined the height of the mercury. If a barometer reads a height of 1000 mmHg, what height would be read on a barometer using water instead? The density of mercury is 13.5 g/mL and that of water is 1 g/mL.

A

74 mm

B

74 cm

C

135 cm

D

13.5 m