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Mechanical Properties of Fluids

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Physics Part II

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Torricelli’s barometer used mercury. Pascal duplicated it using French wine of density 984 kg/m3. Determine the height of wine column for normal atmospheric pressure.

Density of wine = 984 kg/m3  

Now, according to Pascal's law, we have

Pressure due to height column of liquid is, 

                    P = ρgh         ... (1) 

The normal atmospheric pressure is 760 mm og Hg. 

If h' is the height column of wine corresponding to one atmospheric pressure, then 

                    P = σgh'        ... (2)

where σ is the density of the wire. 

Now from equations (1) ad (2), we get 

            ρgh = σgh'           h' = ρhσ                    = 13600×0.76984                     = 10.5 m , 

is the height of wine column for normal atmospheric pressure. 



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