system
Given the following post, respond as if you're commenting on Reddit:
human
Will it ever be possible to measure the true size of an electron?
gpt
The electron is governed by quantum mechanics, for which we need toss the concept of "size" in the definition we know it traditionally. 

Consider the following scenario: Before you've made a measurement on the position of the electron, it's in a superposition of various position states. Making a measurement necessarily knocks out a whole bunch of these states (e.g. we knew it could have been anywhere in the room until we made our measurement, and when we made our measurement we became sure that it was in a small corner of the room), narrowing where we know the particle was when we made the measurement. More precise measuring apparatuses will eliminate more and more of those states in a given measurement until, in the limit of perfect empirical resolution, you resolve the electron to be at a single point in space, and its description becomes that of a Dirac-Delta: zero at all points except exactly where you've measured it. The Dirac Delta is an infinitely high spike and is infinitely narrow, so, to the truest meaning of what we know classically (we've pinpointed the electron to a position, now we measure its size) the electron has a volume of zero!

All subatomic particles, in that sense, have no size. 

We could also *define* size to be the full-width at half maximum of scattering experiments, the same way we do with atomic nuclei, but scattering off an electron to determine properties like its dimensions is impractical: what smaller particle are you going to scatter off an electron to determine these properties? 

**TL;DR** No, because the question isn't appropriate.