Question

Compared to other liquids, why is mercury preferred as a barometric fluid?

• A. Height of mercury barometer is smaller so it is more convenient to handle
• B. Mercury does not stick to the glass surface of barometric tube
• C. Mercury shines so it is easier to take the observations
• D. Coefficient of expansion of mercury is less than other liquids

Answer 1

Answer: (A), (B)

Height of mercury barometer is smaller so it is more convenient to handle
Mercury does not stick to the glass surface of barometric tube

Solution:

Mercury is commonly used as barometers because it's high density means the height of the column can be a reasonable size to esure atmospheric pressure. A barometer using water, for instance,would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.

The Correct Opt :A,B