| Rest Frame |
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| special relativity | |
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The rest frame of compound objects (such as gas or fluid) is taken to be the frame of reference in which the average momentum of the particles which make up the substance is zero (the particles may individually have momentum, but collectively have no net momentum). The rest frame of a container of gas, for example, would be the rest frame of the container itself, in which the gas molecules are not at rest, but are no more likely to be traveling in one direction as another. The rest frame of a river would be the frame of a boat, in which the mean velocity of the water is zero. This frame is also called the center-of-mass frame, or center-of-momentum frame. The center-of-momentum frame is notable for being reference frame in which the total energy (total relativistic energy) of a particle or compound object, is also the Invariant Mass (times the scale-factor Speed Of Light squared). This is the quantity in General Relativity which is connected to an object or system's gravitational field. REFERENCE |
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