text: since all masses in universe rotate isnt linear momentum equivalent to angular? momentum =energy per unit distance x time  the correct formulation of mementum? first of all linear and angular momentum are two different things altogether.it doesn't follows from what you have said that linear momentum = angular momentum. in any case you will always have to multiply the linear momentum by 'r'  to get the angular momentum.  momentum = m*v energy /distance   * time = force * distance /distance  * time =force * time=mass * acc  * time = mass* velocity  so  you are correct dimensionally  energy* space * time=energy *distance * time =force * distance* distance *time =mass* vel *distance^2  so this isn't momentum  curvature of space time will have units of 1/(space time)  find out yourselves whether next two are correct   curvature of gravitational mass ?? you probably mean curvature caused by mass. i am not sure of this part though .in any case curvature will have units of (1/space time)   just remember conservation of energy follows from isotropy of time  conservation of momentum follows from isotropy of space