Working of hydrometer.

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Hydrometer

Hydrometer is a device which measure the density of a given solution.

Hydrometer work based on the Archimedes principle.at that State,


mg=Vρg

Whare ,

m=mass of the hydrometer
g=acceleration due to gravity
V=Volume of displaced liquid
ρ=density of the liquid

Here m and g is constant ,so as density of the solution change the  volume of displaced liquid is also changed.

By measuring displace liquid we can measure the density of the given solution.





As shown in the figure the hydrometer is mounted on the tank. also  one thermometer is  immersed in a given liquid because of the density of the liquid also change with the temperature changes.


So  we need to compensate this density due to change in temperature. so we measure the temperature by using thermometer in order to eliminate the error .





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