In Wikipedia, you can find the definition of the inertial frame of reference, which states:

In classical physics and special relativity, an inertial frame of reference (also inertial reference frame or inertial frame, Galilean reference frame or inertial space) is a frame of reference that describes time and space homogeneously, isotropically, and in a time-independent manner.

Actually, I don't think it's a good definition or a good description. So just like we define the equilibrium state in thermodynamics, can we propose a similar definition by comparison? I mean can we take three reference systems with different constant velocities and make a comparison between the corresponding state of motion and then give the definition of the inertial frame of reference?

  • $\begingroup$ You need to explain, to me at least, why you don't like the definition and what you mean by your reference to equilibrium. Sorry, I just don't follow you :) $\endgroup$ – user140606 Jan 14 '17 at 4:04
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    $\begingroup$ You need at least to add to your quote the last sentence of the first paragraph which is very important: The physics of a system in an inertial frame have no causes external to the system. $\endgroup$ – user130529 Jan 14 '17 at 8:00
  • $\begingroup$ Add some description, is that correct? $\endgroup$ – Jack Jan 14 '17 at 10:02

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