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https://www.lansoinstruments.com/how-does-an-air-pressure-gauge-work.html

How does a bourdon type pressure gauge work?

Pressure tubes function by taking the pressure and converting it into mechanical energy. This energy moves a dial in our best air pressure gauge, displaying the current amount of pressure in the system. ... As pressure increases inside the tube, the force of the fluid attempts to straighten out the curved tube.

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