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| In physics, a '''world tube''' is the path of an object that occupies a nonzero region of space (nonzero ]) at every moment in time, as it travels through 4-]al ]. That is, as it propagates in ], a world tube traces out a three-dimensional ] for every moment in time.<ref>Malcolm Ludvigsen: ''General relativity: a geometric approach'', Cambridge University Press, 1999, {{ISBN|0-521-63019-3}}, </ref> The world tube is analogous to the one-dimensional ] in that it describes the time evolution of an object in space, with the difference that a world line represents the path of a ] (of nonzero volume), whereas a world tube occupies finite space at all moments in time. | |||
| The concept of world tube is particularly relevant for ], where a world tube is embedded in ]. | |||
| ==See also== | |||
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| * ] | |||
| ==References== | |||
| {{reflist}} | |||
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| {{relativity-stub}} | |||
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