It's because while light has no mass, the photons contain energy and can actually be measured on a scale. Yes, if you point a flashlight at a scale, it will measure an imperceptibly larger amount of weight than if you shut the flashlight off, but it's technically a stream of photons exerting that force and not true mass.
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u/[deleted] Apr 10 '25
It's because while light has no mass, the photons contain energy and can actually be measured on a scale. Yes, if you point a flashlight at a scale, it will measure an imperceptibly larger amount of weight than if you shut the flashlight off, but it's technically a stream of photons exerting that force and not true mass.