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Solving an Air Pressure Question: Who Is Right?
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[QUOTE="BvU, post: 6851173, member: 499340"] 1. A [URL='https://en.wikipedia.org/wiki/Barometer#Mercury_barometers']mercury barometer[/URL] is a pipe with a closed top that is long enough to have a [B]vacuum[/B] above the mercury. So yes, there is sufficient Hg to fill a column. 2. I have no idea what an epruvete is (google come up with that ?). But from the picture I expect the pipe is not empty at all, but filled with air. There is no Hg here, so they mean the density of water. The pressure at the water level in the pipe is ambient pressure plus some ##\rho g \,\Delta h## : [ATTACH type="full" alt="1675557901350.png"]321768[/ATTACH] which I hope you understand by now... ? ( height(of epruvete - h) ... :nb) ?) ##\ ## [/QUOTE]
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Solving an Air Pressure Question: Who Is Right?
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