why is low density liquid used as a manometric liquid in a physics laboratory
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12.16. The pressure differential is applied at both ends of the tube, making the manometer fluid move downward in one limb and upward in the other, until the forces acting on the fluid are in balance.
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An open tube manometer measures the gauge pressure, p−p
0
=hpg, where p is the pressure being measured, p
0
, is the atmospheric pressure, h is the difference in height between the manometric liquid of density p in the two arms. For a given pressure p, the product hp is constant. That is, p should be small for h to be large. Therefore, for noticeably large h, a laboratory manometer uses a low-density liquid
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