3 ms·By "lightweight", do you mean the weight of photons?by andrelaszlo 4y agoBy "lightweight", do you mean the weight of photons?smegsicle 4y agoyou haven't noticed that copper wires sag under heavy current?mr_toad 4y agoYou jest, but https://physics.stackexchange.com/questions/9615/why-do-power-lines-sag-when-they-are-heated-up#9617 https://physics.stackexchange.com/questions/9615/why-do-powe...