Question

Why is mercury used in a barometer?

• A. Mercury flows easily.
• B. The density of mercury is less as compared to other fluids.
• C. Changes in mercury level are easier to detect.
• D. The density of mercury is high as compared to other fluids.

Answer 1

The correct option is A

The density of mercury is high as compared to other fluids.

1. Mercury is dense. Due to this property, changes in the height of mercury in the barometer tube with changes in pressure are very rational. Due to the nature of this mercury, barometers can be used to measure very high pressures, but with other low-density materials, the change in height due to pressure is very large and the construction of such equipment is not possible. It's very difficult.
2. Again, mercury is a shiny metal that can be easily identified and measured in the barometer tube. Due to this luminescent property of mercury, it can make its measurements stand out clearly.
3. In addition, mercury has a relatively lower specific heat than other elements. Mercury is also a good conductor of heat. Therefore, if the temperature of the system changes, mercury can reach that temperature sooner.