World tube
In physics, a world tube is the path of an object that occupies a nonzero region of space at every moment in time, as it travels through 4-dimensional spacetime. That is, as it propagates in spacetime, a world tube traces out a three-dimensional volume for every moment in time. The world tube is analogous to the one-dimensional world line in that it describes the time evolution of an object in space, with the difference that a world line represents the path of a point particle, whereas a world tube occupies finite space at all moments in time.
The concept of world tube is particularly relevant for special relativity, where a world tube is embedded in Minkowski space.
