Because water is 13.6 times less dense than mercury, an atmospheric pressure of 76 cm (30 in.) of mercury would be equivalent to 1034 cm (408 in.) of water. Therefore, a water barometer resting on the ground near sea level would have to be read from a ladder over ____ tall.?
a. 5 m (16 ft)
b. ?10 m (33 ft)
c. ?15 m (49 ft)
d. ?20 m (66 ft)
e. ?25 m (82 ft)
ANSWER: b
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