Question

What is simple barometer

Answer 1

Barometers and atmospheric pressure calculations. When atmospheric pressure is measured by a barometer, the pressure is also referred to as the "barometric pressure". Assume a barometer with a cross-sectional area A, a height h, filled with mercury from the bottom at Point B to the top at Point C.

Answer 2

A barometer is a scientific instrument used in meterolgy to measure atmospheric pressure.
This a barometer in the image