Question

What does quantisation of electric charge mean?

Answer 1

Quantization indicates specific values. Discrete not continuos. Quantization of charge means that value of charge can take only certain discrete values. It cannot arbitrarily be any value. Charge can be in integral multiples of approximately 1.6∗10−19∗10−19 coloumbs. It cannot be say 1.5∗(1.6∗10−19).1.5∗(1.6∗10−19).

This is because the lowest stable charge is that of an electron/proton which is the above mentioned value. If any object is charged it is because of excess or deficiency of electrons.
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Answer 2

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Electric charge of a body is quantized.

This means that only integral (1, 2, …., n) number of electrons can be transferred from one body to the other.

Charges are not transferred in fraction.

Hence, a body possesses total charge only in integral multiples of electric charge.

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