RAPIDITY

Rapidity

In relativity, rapidity is an alternative to speed as a measure of motion. On parallel velocities rapidities are simply additive, unlike speeds at relativistic velocities. For low speeds, rapidity and speed are proportional, but for high speeds, rapidity takes a larger value. The rapidity of light is infinite.

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rapidity

Noun

  1. speed, swiftness; the condition of being rapid
  2. A measure of velocity relative to the speed of light
  3. A measure of the velocity of a particle in a beam relative to the beam#s axis


The above text is a snippet from Wiktionary: rapidity
and as such is available under the Creative Commons Attribution/Share-Alike License.

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