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Quantisation of electric charge is a basic (unexplained) law of nature; interestingly, there is no analogous law on quantisation of mass.

Does this mean we can have arbitrarily small masses? In particular, can we have masses smaller than the electron?

User Khriz
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Final answer:

Electric charge is quantized with the smallest unit being the charge of an electron, but mass does not follow a law of quantization, allowing for masses smaller than that of an electron, such as neutrinos.

Step-by-step explanation:

While charge is quantized, meaning that the electric charge comes in discrete amounts (the smallest being the charge of an electron, which is 1.602 × 10-19 C), there is no analogous law for the quantization of mass. This indeed suggests that mass can be arbitrarily small, and there are particles with masses smaller than that of the electron.

Neutrinos are an example of such particles with extremely small, yet non-zero mass. In the realm of quantum physics, the concept of quantization extends to energy and angular momentum as well.

Electric charge is quantized, meaning it comes in discrete amounts. There is a smallest possible amount of charge that an object can have, which is the charge carried by a single electron. No free particle can have less charge than this, and all charges on objects must be integer multiples of this amount.

On the other hand, mass is not quantized like charge. There is no analogous law of nature that quantizes mass. This means that there can be arbitrarily small masses, including masses smaller than the mass of an electron.

To summarize, charge is quantized with a smallest possible amount, while mass is not quantized, allowing for arbitrarily small masses.