relativity of simultaneity length contraction time dilation Doppler effect relativistic mass a universal speed limit mass–energy equivalence Thomas precession spatial spacetime interval mass energy mass–energy equivalence speed of light two postulates physics
Special relativity has a wide range of consequences that have been experimentally verified. They include the relativity of simultaneity, length contraction, time dilation, the relativistic velocity addition formula, the relativistic Doppler effect, relativistic mass, a universal speed limit, mass–energy equivalence, the speed of causality and the Thomas precession. It has, for example, replaced the conventional notion of an absolute universal time with the notion of a time that is dependent on reference frame and spatial position. Rather than an invariant time interval between two events, there is an invariant spacetime interval. Combined with other laws of physics, the two postulates of special relativity predict the equivalence of mass and energy, as expressed in the mass–energy equivalence formula 



E
=
m

c

2




{\displaystyle E=mc^{2}}

, where 



c


{\displaystyle c}

 is the speed of light in vacuum. It also explains how the phenomena of electricity and magnetism are related.
