Spyke

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Realistically, how much power would Valve's Portal Gun require? How heavy would it be? And how would cooling work with it?

Since portals aren't real, maybe we can start from what we see in game: Chell can hold it for long periods of time without problem, so that puts an upper weight barrier on it. Aperture must've figured out a way to fit portal technology into it, or found a way to stash its mass away. Or maybe it's heavier than average, but Chell is drugged to be able to hold it.

There's no power cord in-game, so its energy source must be self-contained, because I don't think it can get enough power by absorbing things in the air.