Dielectric constant of water is 81. What does it mean?

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Solution

Dear Student,
Water's dielectric constant of 81 means that electric fields are reduced by 81 times in water compared with their values in vacuum.
E= $1 / 81$ times that of it's value in vacuum. If water is used as a dielectric between the Parallel plates Capacitor.It's capacitance becomes 81 times .
In our Daily Life we use water many times as Solvent.To dissolve ionic compounds a solvent must also have a high dielectric constant.That is one of the reason Water acts as a good Solvent.

Regards

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