Simple Mercury Barometer | Pressure

Simple Mercury Barometer | Pressure
Form 5 Physics KSSM Chapter 2 - Pressure
Simple Mercury Barometer:
1. Atmospheric pressure can be measured by a simple barometer.
2. A thick glass tube (at least 1m long) is filled with mercury completely.
3. The open end of the tube is covered with a finger and inverted in a trough of mercury.
4. The height of the mercury is proportional to the atmospheric pressure.
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[@aswinkumar731]

but in pressure diagram, we represent datum line as absolute zero pressure, and 760mm of hg as atmospheric pressure.In order to represent vaccum pressure,we go below the atmospheric pressure line.In that case how to represent -84cm of mercury

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Can you provide me every equations which governed the mechanical barometer So we know the efficiency of barometer as an engine which is functional under atmospheric pressure Now we need to make a mechanical barometer which can give output when 10^14 kg pressure applied on it So we got some mechanical output which can turned the turbine and Dynamo make electricity which can cooked out our food by using microwave oven for one hour 😃😃😃👅👅😃😃👅😃👅👅👅😃😃👅😃