In such a system, the mass which the scale weighs is the invariant mass, and it depends on the total energy of the system.
32.
In other reference frames, the energy of the system increases, but system momentum is subtracted from this, so that the invariant mass remains unchanged.
33.
The term also applies to the invariant mass of systems when the system as a whole is not " moving " ( has no net momentum ).
34.
Thus, by calculating the invariant mass of pairs of photons in a particle detector, pairs can be identified that were probably produced by pion disintegration.
35.
By contrast, the rest mass and invariant masses of systems and particles are " both " conserved " and " also invariant.
36.
With the implication from ( ) that the invariant mass is also the centre of momentum ( COM ) mass-energy, aside from the factor:
37.
I don't think it makes sense to talk about the photon frame of reference with respect to other frames that are related by invariant mass.
38.
According to the article Photon, photons have'invariant mass', but I'm not sure I understand what'invariant mass'is.
39.
According to the article Photon, photons have'invariant mass', but I'm not sure I understand what'invariant mass'is.
40.
That's true for relativistic mass, not true for invariant mass .-- talk ) 18 : 17, 22 November 2010 ( UTC)
