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What is difference between barometer and...

What is difference between barometer and nanometer ?

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Barometer is used for measurement of pressure of atmosphere and nanometer is used for measurement of pressure of gases.
Example : Pressure of barometer is 740 mm of Hg and difference between two end of nanometer is 2.1 cm. Then calculate pressure of Gas ?
Pressure of Gas = Pressure of barometer - Difference between two end
`= 740-(2.1xx10) [because 2.1 cm = 2.1xx10 mm]`
= 719 mm Hg.
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