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प्रश्न
Why is a low-density liquid used as a manometric liquid in a physics laboratory?
उत्तर
A low-density liquid helps in having a larger level difference between the level of liquid in the two arms of the manometer.
Let,
pO be the atmospheric pressure,
h be the height difference between the manometric liquid in the two arms,
ρ be the density of the liquid in the manometer,
g is the acceleration due to gravity.
Then, the pressure to be measured (p) is given by,
p = pO + hρg
For a given pressure p, the product hρ is constant. That is, ρ should be small for h to be large. Therefore, for large h, a low-density liquid is used as a manometric liquid in a physics laboratory.
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