time In the real world, the passage of time is a universal experience which clocks of various kinds have been designed to measure. In a mathematical model, time is represented by a real variable, usually denoted by t, with t = 0 corresponding to some suitable starting point. An observer associated with a frame of reference has the capability to measure the duration of time intervals between events occurring in the problem being investigated.
Time has the dimension T, and the SI unit of measurement is the second. See simultaneity, time dilation. |