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Physics
Classical Physics
Mechanics
A manometer measures mechanical or thermodynamic pressure?
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[QUOTE="Andrew Mason, post: 6058541, member: 15795"] Thermodynamic pressure is defined for a substance that is in thermodynamic equilibrium. It is the force per unit area exerted by such a substance on the boundary interface with another substance (eg. the walls of a container) that mechanically contains the substance. A substance that is not in thermodynamic equilibrium (eg. a flowing substance) exerts a mechanical pressure (on the pipe walls, for example) but does not have a precisely defined thermodynamic pressure. The manometer measures the difference between the mechanical pressure exerted by a substance on the container walls and the ambient (e.g. atmospheric) pressure. If the substance is in thermodynamic equilibrium (not flowing) it measures the difference between thermodynamic pressure and ambient pressure. AM [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
A manometer measures mechanical or thermodynamic pressure?
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