Question

Which property of mercury is the main reason for its use in barometers?

• A. High density
• B. Negligible capillarity effect
• C. Very low vapour pressure
• D. Low compressibility

Answer 1

Answer:

C. Very low vapour pressure

Mercury's low vapor pressure makes it an ideal fluid for use in barometers. It doesn't wet the glass, is a good conductor of heat, and expands evenly with temperature. These properties make it a reliable and accurate instrument for measuring atmospheric pressure.