Physical Definition of Time

In summary, the concept of time is difficult to define and is often described as what a clock measures. Without the movement of energy, the universe would come to a standstill, but this does not necessarily have anything to do with time. The question of whether time is qualitative or quantitative remains unanswered and is still a topic of debate in physics. This discussion should be approached from a scientific perspective rather than a philosophical one.
  • #1
Andy_K
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Can we say that TIME is essentially the progression of energy from one state to another, in its long cosmic quest to achieve equilibrium?

Without the movement of electromagnetic waves and transfer of energy, the entire universe would come to a standstill — an inanimate, “frozen” world.

Time thus appears to be an abstract, high-level representation of such animation; just as “music” is merely a conceptual representation of vibrating particles.

Can we thus say that intrinsically, time is only qualitative — a difference of states; whereas the quantitative value or magnitude — the perceived speed of time — is an illusion subjective to the observer, as demonstrated by Einstein’s relativity?

Thank you.

p/s: This is intended as a question on physics, not from a philosophical perspective :)
 
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  • #2
The best and perhaps least satisfying answer to your question is that time is that which a clock measures. Like other physical quantities if you cannot define it operationally then you have an essentially meaningly interpretation as far as physics is concerned.
 
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  • #3
i need help with this question too, But I believe a lot of our science involving time began as qualitative and resulted in quantitative concepts that are now proven mathematically and depend on time. Time is qualitative from the standpoint that we have not figured out how to move things (i.e. People from point to point) but it is related quantitatively in applications such as mechanics, material science, and other areas of engineering. What qualitative ideas go on in theoretical physics?
 
  • #4
Andy_K said:
Can we say that TIME is essentially the progression of energy from one state to another, in its long cosmic quest to achieve equilibrium?

We cannot.

Andy_K said:
Without the movement of electromagnetic waves and transfer of energy, the entire universe would come to a standstill — an inanimate, “frozen” world.

Assuming all motion ceases and no disturbances of any kind propagate through the universe, then yes, everything would be "frozen". But this has nothing to do with time as far as we know.

Andy_K said:
p/s: This is intended as a question on physics, not from a philosophical perspective :)

Perhaps, but this topic is almost always a fast track to nowhere. As Inventive said, the most accurate (but least satisfying) answer is that "Time is what a clock measures". You can get into the details of how time is treated and what is known about it in terms of General Relativity, but most of these boil right back down to "Time is what a clock measures".

If you'd like to know more from the standpoint of General Relativity, feel free to start a thread in the Relativity forum. But I'm going to lock this thread since your question is essentially unanswerable and this topic attracts speculation and personal opinions like nothing else...

Thread locked.
 
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What is the physical definition of time?

The physical definition of time is the measurement of the duration between events or the progression of events in the physical world. It is a fundamental quantity in physics and is often referred to as the fourth dimension.

How is time measured in physics?

In physics, time is measured using a clock or other time-keeping devices. These devices use a consistent and repeatable process, such as the oscillation of a pendulum or the decay of radioactive elements, to measure the duration of events.

Is time constant or does it change?

According to Einstein's theory of relativity, time is not constant but is relative to the observer and the speed at which they are moving. This means that time can appear to pass at different rates for different observers.

What is the relationship between time and space?

In physics, time and space are considered to be interrelated and form the fabric of the universe, known as spacetime. This means that events in the physical world occur in both space and time, and cannot be separated from one another.

Can time travel be possible?

The concept of time travel is still a subject of debate in the scientific community. While some theories, such as Einstein's theory of relativity, suggest that it is possible to travel through time, the technology and methods to do so have not yet been discovered or proven to be feasible.

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