Time has many definitions per se, but the basic idea being it's "the measurement of change" so as we know, all matter looses it's ability of changing with the loss of kinetic energy. and the where it becomes zero is the absolute zero (−273.15°C). so my question would be, will time stop/freeze at Absolute zero? and does time get slow while reaching there?


closed as unclear what you're asking by ACuriousMind, Kyle Kanos, David Z May 12 '15 at 17:30

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    $\begingroup$ What does "time stops/freezes" even mean? $\endgroup$ – ACuriousMind May 12 '15 at 16:46
  • $\begingroup$ and also, stuff doesn't really stop moving at absolute zero. Things still have Zero Point Energy. $\endgroup$ – Hritik Narayan May 12 '15 at 16:48
  • $\begingroup$ @ACuriousMind I don't know any technical term, but you heard me once. it means to stop the changing happening. $\endgroup$ – AACaN May 12 '15 at 16:52
  • $\begingroup$ @HritikNarayan i need to read more about that. thanks. so this Zero point energy may still cause changes in matter??? $\endgroup$ – AACaN May 12 '15 at 16:55
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    $\begingroup$ The basic idea of time is that is is one of four dimensions in spacetime. The fact that it seems to be related to change or entropy is fascinating, but as far as we know that doesn't rise to the level of a definition of time. $\endgroup$ – Brionius May 12 '15 at 17:12

You are confusing time with the flow of time.

Time is just a coordinate like the spatial coordinates, that is we label spacetime points with four coordinates $(t, x, y, z)$. Indeed, in relativity (both flavours) the time and spatial coordinates get mixed up so different observers will disagree about what is time and what is space.

But the obvious thing about time is that to us humans it appears to flow. We can stand still in space, but we have to keep moving through time at one second per second. I would guess this is what you're thinking of when you say that time is "the measurement of change". The curious thing is that the flow of time doesn't really exist in physics, and some (exactly how many I don't know) physicists believe that the flow of time is a trick of human perception and that time doesn't flow at all. Viewed in this light your question is meaningless, because you are asking about something that doesn't exist.

But even if you take the conventional view of the flow of time, motion does not stop at absolute zero. This is because quantum systems exhibit zero point energy, so their energy remains non-zero even when the temperature is absolute zero. For example helium remains fluid at absolute zero because its zero point energy is too great to allow it to crystallise. So there is no sense in which time stops as we lower the temperature to absolute zero.

  • $\begingroup$ Clearly things we learn here at Highschool are just lies. Thermodynamics 101 $\endgroup$ – AACaN May 13 '15 at 13:54

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