What is the Difference Between Mercury and Aneroid Barometer?

The main difference between mercury and aneroid barometers lies in their operation principles and the materials used to measure atmospheric pressure. Here are the key differences:

• Mercury Barometer: This type of barometer measures atmospheric pressure by balancing a column of mercury inside a sealed tube. The height of the mercury column is measured to determine air pressure. Mercury barometers are large, fragile, and difficult to transport.
• Aneroid Barometer: Aneroid barometers do not use liquid to measure atmospheric pressure. Instead, they employ an evacuated capsule that deflects with changes in atmospheric pressure. The amount of deflection is coupled to an indicating needle, which measures the pressure. Aneroid barometers are more compact, stable, and easy to transport compared to mercury barometers.

In summary, mercury barometers use a column of mercury to measure air pressure, while aneroid barometers use a deflecting capsule to achieve the same purpose. Aneroid barometers are more portable and stable, making them more practical for various applications.

Comparative Table: Mercury vs Aneroid Barometer

Here is a table comparing the differences between mercury and aneroid barometers:

Both mercury and aneroid barometers are used to measure atmospheric pressure, but they utilize different working principles and mechanisms. The mercury barometer measures pressure using the height of a mercury column in a sealed tube, while the aneroid barometer measures pressure using the expansion of a flexible metal box. Mercury barometers are calibrated using a mercury barometer, while aneroid barometers can be calibrated in Millibars or mmHg.