Can open-tube manometers be used to measure atmospheric pressure?
Physics Asked on January 2, 2021
I was going through a slide made by my physics professor and was wondering about the statement made at the bottom: “This cannot be used to measure the atmospheric pressure”.
Why is that so?
Given the derived equation: if we knew the pressure of a different inert gas (enclosed in the chamber), the density of the liquid and the height, could we not solve for the atmospheric pressure (on the exposed end of the device)?
One Answer
The open tube manometer measures the pressure difference between the gas in the container and the air outside. If you have atmospheric pressure on both sides of the liquid, the height in the two sides is equal ($y_2=y_1$). You get that the pressure difference is $0$, but not what the pressure is.
Answered by Andrei on January 2, 2021
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