I have been wondering since a very long time, whether its possible that Charge and mass has some intimate relationship, like Energy-matter. You see, energy exists as energy and matter exists as matter. But, they both are inter convertible under some provided circumstances. Can that also be possible with Charge and mass? Can it be something, like on the lines of, charge equivalence of mass - much like mechanical equivalent of heat. (If yes, then the whole branch of Entropy, probability of a process' reversibility turns brilliantly exciting.) I'd like to add few supportive points which provoked me to above question. Point no one, I'd like to add is that, when Dark matter and Dark energy doesn't interact with normal matter or energy, does that imply that they are charge less/mass less 'things' and 'interactions'? I don't know how to explain this and hope some one is understanding this. Second point is that, whether the quantities of matter and mass can be separated? I am speaking of the property 'mass' not merely the ability 'mass'. (This sentence, in some tiny sense, can be translated as the contrast between Gravitational mass and Inertial mass. Its not my intention though). I don't know of any particle which has mass but hasn't got the 'stuff', but I know of the vice-versa. E.g. Photon. If there exists any let me know. These were points that made me think. Let me know either if the above two points needs to be explained or the question I asked may be answered. If so in what lines? I tried my best to describe using the words I can, but I am not satisfied. Hope you understand what I wanted to say.