A Description Alphabetical, in Terms of Matters Physic.

I am acceleration. I am a barycenter. I am 299,792,458 meters per second ( _c_ ). I am distance. I am energy. I am force. I am -9.81 meters per second per second ( _g_ ). I am height. I am the square root of -1 ( _i_ ). I am a Joule of work. I am kinetic energy. I am length. I am density times volume (mass, _m_ ). I am some number ( _n_ ). I am open in my geometry. I am momentum ( _p_ ). I am a quark. I am a radius. I am displacement ( _s_ ). I am time. I am potential energy ( _U_ ). I am velocity. I am an X-ray. I am young. I am redshift ( _z_ ).