So, I have some questions regarding 'dimensions' and 'parameters' in physics. (there are differences in the meaning between physics and mathematics, as far as I understand it) ---- As far as I understand it, we live in a 4-dimensional world, consisting of 3 space and 1 time dimensions. Yet we combine them to form 4 dimensions of spacetime? Does this mean that we only need 4 points to describe where a particle is? If so, that raises (at least to me) the following question: ---- What are the amount of variables needed to completely describe a particle? Is that even possible? It would seem to me you need more information than just these 4 dimensions to describe something fully. Namely not only where it is, but also what it is. So what else do we need? Mass, probably? Charge? What else? Can we even assign these things, or do they only appear in relation to other objects? Can we describe a particle fully? If not, what is the maximum amount of information we can have about a particle at any given time? ---- Now, let's assume we could describe a particle fully and completely with just 6 variables. 3 for space, 1 for time, 1 for charge and 1 for mass. What is then the difference between space & time on the one hand, and charge & mass on the other? What makes space & time dimensions, but the other's not? ---- I hope somebody a little smarter than I can explain these things to me, or explain to me why I am not asking the right questions if that's the case.