Time
المؤلف:
GEORGE A. HOADLEY
المصدر:
Essentials of Physics
الجزء والصفحة:
2025-10-21
41
The unit of time in physics is the second. This is the second of mean solar time, and is 
of the mean solar day. Mean solar time is the time in common use, recorded by clocks and watches.
According to Albert Einstein's theory of relativity, time and mass and dimensions vary with the velocity of the motion of the body concerned. This variation is important for very'great velocities, comparable with the velocity of light, but for moderate velocities it is so infinitesimally small as to have no effect. Hence time and the masses and measurements of ordinary bodies in physics are not affected by this theory.
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