Did you know that there are two definitions of time and they do not agree!

In our daily lives, most of us experience time as a certainty, always moving in the right direction, at a rate that can be easily measured and agreed upon by all observers. But when two observers compare what they are experiencing, for themselves, as one second, they do not always agree. This was not explained until the early twentieth century, with the emergence of Einstein's theory of relativity. The surprise is that the same time, long considered fundamental and universal, is actually relative, meaning that different observers will feel the flow of time differently from each other, as long as they move through space at different speeds or in different directions. Whether two events occur simultaneously or one occurs before the other, depends entirely on the observer's point of view.

Time arrow, or time arrow:

But, despite the ambiguity of time, there are some facts about it that all observers can agree on. Perhaps the most fundamental of these facts, and perhaps the most confusing, is that everyone, in his idle reference sentence, sees time always moving forward at the same rate: one second every second. This fact is known as the "arrow of time", or specifically our perceptual time arrow. There are many ideas about what makes us experience it the way we experience it, and one idea that has been put forward is the only other "arrow of time" that we know: the arrow of time defined by thermodynamics.

Single side:

With every passing moment, no matter what happens around us, we find ourselves experiencing the most primitive and monotonous form of time travel: the slow passage of time that passes us as we progress into the future. With each passing moment, time continues to propagate to the direction where it was moving, maintaining its constant speed, moving the right distance at each given time interval, regardless of what is happening around it. At any moment, in any circumstance, time does not seem to hold or reverse; it can only continue to advance into the future. In other words, the arrow of time always points to the forward direction of anything inside our universe. But this is a mystery to fundamental physics, as there is no explanation for why it behaved in this way. The laws of nature, with very few exceptions, are completely chronologically symmetrical. From Newton to Einstein, the equations that govern reality have no preferred direction for the flow of time. The behavior of any sentence can be described by equations that work in the forward direction as well as in the reverse direction. For example, we can move "backward" as well as "forward" in any of our three spatial dimensions. But somehow, time is different.

Entropy:

With all this in mind, where does our arrow of time come from? According to many people, there seems to be a proposed link between what we perceive as the arrow of time and a quantity called entropy, commonly known as the "scale of chaos" in a physical sentence. If you had more options for how to arrange the sentence so that it remains the same, you had higher entropy than if there were fewer options. For example, a box with a "hot" and "cold" side separated by a barrier has less entropy than a box in which the elements mix well after the barrier has been removed.

The relationship between time and entropy:

Whenever we discuss entropy, we need to keep in mind that we are constrained by the laws of thermodynamics. In particular, the second law is of great importance, as it states that the entropy of closed and isolated sentences that do not allow the exchange of matter or energy with the external environment can only increase or remain the same over time; Since the universe is closed and almost isolated (this approximation is very good for almost all applications), the entropy of the entire universe must increase over time. It is the only known law in physics that seems to show a preferred direction of time.

Does this mean that it is possible to test time the way we do it only because of the second law of thermodynamics? If so, this suggests a deep connection between the arrow of time and entropy. If the arrow of imagined time is always moving forward, no matter what happens to entropy within a sentence, then this proposed correlation would not be real. But reversing the flow of entropy inside most sentences is easier said than done; we can easily beat an egg and then cook it, but vice versa returning the egg after cooking it to its initial position and separating its components is not as easy. The same situation applies when we dissolve sugar and cream in coffee; homogenizing the mixture is much easier than separating its ingredients. In both examples, the entropy in the final state is higher than in the initial state. So, in practice, entropy reversal never occurs automatically. This may determine the thermodynamic arrow's direction forward as entropy increases.

Nature is full of examples such as mixing coffee with cream or whipping and cooking eggs: what we traditionally call "irreversible reactions" in physics. If you drop an ice cube into warm juice, the ice will melt, resulting in a cold juice at a uniform temperature below its temperature before the ice cube was placed in it. But it is impossible for a cooled juice to automatically separate into warm juice and an ice cube; this is prohibited under the second law of thermodynamics. This is the price that thermodynamic laws draw from the universe over time: the total entropy of a closed and isolated system can never decline.