Atmospheric pressure is calculated by the ____?

ماحولیاتی دباؤ کا حساب ____ سے کیا جاتا ہے؟

Height of water column in a pipette

Volume of gas in a cylinder

Resistance in an electric circuit

Height of mercury column in barometer

A barometer measures atmospheric pressure by measuring the height of a mercury column that is supported by the pressure of the surrounding air.
The higher the mercury column, the higher the atmospheric pressure.