| > Does this mean that if you move an object away from Earth's gravitational influence it will increase in mass because it has more potential energy? Gravitational potential energy is a little different. It's the energy that the object would have if it fell to earth, it doesn't actually exist until it starts falling. (correct this, i'm sure i'm wrong) > What about if you heated something up, does it gain mass then? Yes, but it's incredibly miniscule to the point that it's not worth looking at in most situations > How about sound? Does the sound of my voice cause imperceptible ripples of increased mass as it vibrates everything that it touches? This one I think does but it's going to be so small that you also won't notice it. What you would be able to notice though are the subtle changes in density at the peaks and troughs of the wave. > Is a charged battery heavier than an empty one? Maybe. This depends on the chemistry of the battery more than anything. Some of them will oxidize as it gives out energy and give off the oxygen when charging. While the energy will contribute slightly to the mass because of the chemcical bonds, the battery will change mass more because of the lost/gained atoms than any other cause. > Is glass heavier with light travelling through it? I really don't know how to answer this one. The photon never really becomes part of the glass as far as I'm aware, but some will be absorbed and raise the temperature so maybe? |
[1] https://en.wikipedia.org/wiki/Mass-energy_equivalence#Meanin...