Question

The level of mercury in the glass trough increases or decreases with the change in atmospheric pressure. Thus a permanent scale cannot be marked on the glass tube is an advantage of a barometer. type A for statement is true neither B.

Answer 1

A simple mercury barometer has the following defects.

1. As the apparatus is all glass, therefore, there is a chance of its breaking.
2. The level of mercury in the glass trough increases or decreases with the change in atmospheric pressure. Thus a permanent scale cannot be marked on the glass tube.
3. It is neither compact nor portable. Thus it cannot be carried to different places.

Advantages of a Fortin's Barometer over a simple mercury barometer.

1. The Fortin's barometer is an improved version of the simple mercury barometer.
2. The barometer tube is encased in a brass frame. This enables it to be carried around easily.
3. Vernier scale is used for taking reading for extra accuracy.