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Why is a low density liquid used as a manometric liquid in a physics laboratory?
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An open tube manometer measures the gauge pressure, p = p0 + hρg, where p is the pressure being measured, p0 is the atmospheric pressure, h is the difference in height between the manometric liquid of density ρ in the two arms. For a given pressure p, the product hρ is constant. That is, ρ should be small for h to be large. Therefore, for noticeably large h, laboratory manometer uses a low density liquid.
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