Pressure is often given in terms of a liquid column and is expressed as pressure head. Express

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Pressure is often given in terms of a liquid column and is expressed as “pressure head.” Express the standard atmospheric pressure in terms of 

(a) Mercury (SG = 13.6),

(b) Water (SG = 1.0), 

(c) Glycerin (SG = 1.26) columns. 

Explain why we usually use mercury in manometers.

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