Question

Give reasons for the following,

Mercury is used in a barometer.

Answer 1

Explanation for correct option

1. Mercury is the most widely used liquid in a barometer, while other fluids may also be employed.
2. Due to its (mercury) density, the barometer's vertical column can be made to be a tolerable size.
3. For instance, if water were used, the column would need to be 34 feet tall.
4. A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.

Thus, the liquid used in a simple barometer is mercury.