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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
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likely to be traveling in one direction than another. The rest frame of a river would be the frame of an unpowered boat, in which the mean velocity of the water is zero. This frame is also called the center-of-mass frame, or
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it is essential to specify the rest frame of any time measurements, as the time that an event occurred is dependent on the rest frame of the observer. For this reason the timings of astronomical events such as
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supernova to Earth, the supernova occurred in the 11th
Century AD only a short while before the light reached Earth, but in Earth's rest frame the event occurred about 6300 years earlier.
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The center-of-momentum frame is notable for being the reference frame in which the total energy (total relativistic energy) of a particle or compound object, is also the
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See p. 139-140 for discussion of the stress-energy tensor for a perfect fluid such as an ideal gas.
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squared). It is also the reference frame in which the object or system has minimum total energy.
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The rest frame of compound objects (such as a fluid, or a solid made of many vibrating
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are usually recorded in terms of when the light from the event reached
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attached to physical markers) in which the particle is at rest.
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Frame of reference in which a specified particle is at rest
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