"What is time?" she asked. "As we have said before, the universe is a matter, and it moves as a whole. Now, we have to ask: What was time? Was time a matter? " In fact, we haven't defined matter yet. We haven't explained what matter is. We only say that the universe is material, but one thing we can be sure of is that time is not material. This is because in the universe, matter can be divided into parts, and different parts have different positions in the universe. Now, we can't find a part called time in the universe, nor can we find the position where time exists, so time is not matter.
So, what exactly was time?
Time was a method invented by humans to describe the changes in the movement of matter. It was used to record the order of the state of movement of matter and compare the changes in the movement of matter. To put it bluntly, time was the serial number that people gave to the state of motion of matter. Some people might disagree with the statement that time was a method invented by humans. They believed that time was an objective existence that did not depend on humans. If we had to find the objective physical direction of time, then time referred to the persistence of the overall state of motion and change of matter. The universe was made of matter, and matter was in motion. The matter in the universe always changed from one state to another, and the duration of this change was time.
absolute time
The absolute time we speak of is different from Newton's absolute time. Newton's absolute time existed independently and had nothing to do with external things. It passed by itself evenly, and the absolute time we talked about was a way to describe the overall changes of the universe. It referred to the continuity of the overall movement of the universe and was used to record the order of the overall state of the universe. In fact, we have no way to grasp how the overall state of the universe changes, so absolute time only exists in theory. In reality, we can't get it.
relative time
In reality, time is obtained by comparing the changes in the state of motion of different substances. We always use the change in the state of motion of a certain substance as the standard and compare other things to obtain time. We call the time obtained through this method relative time. In fact, the time we usually talk about, such as years, months, days, etc., are all relative time.
Relativistic Time Dilation
Here, because time was not an objective existence that was independent of matter as Newton said, it was just a method used by people to describe the changes in the movement of matter. Therefore, the change in time must be closely related to the change in the state of motion of matter. When we choose different substances as the standard time, we get different times. When the state of motion of the matter we choose as the standard time changes, the time we get will also change. The so-called time expansion in the theory of relativity was actually due to the choice of two different substances (clocks) as the time standard. Because the two substances (clocks) as the time standard had different states of motion, the time obtained from them was also different, thus the "time expansion" appeared. If we only used one substance as the time standard, then there would be no so-called time expansion.
Physical Time and Mathematical Time
Physical time was derived from the change in the state of motion of matter. It was related to the change in the state of motion of matter. If the state of matter did not change, then there would be no problem with time. " We can imagine that if the entire universe is fixed in a certain state, then 10,000 years and one second are no different.
Mathematical time is a set of mathematical methods that we use to deal with time data. Mathematical time can be independent of the state of motion of matter. We can think of it as independent of any matter and passing evenly. However, in reality, we should never equate mathematical time with physical time and think that the movement of matter depends on the change of time.
Time is continuous
The universe's matter always changed from one state to another. This change was continuous, so the time used to describe the change of the universe's matter state was also continuous.
Time is infinitely divided
The physical direction of time is the persistence of the overall state of the universe's matter. Because the change of the state of matter is a continuous process, there is no beginning and no end, so time is not divided or inseparable. However, the shortest time interval in physics is limited by our observation limit. Only in mathematics could time be divided. Then, in mathematics, was time infinitely divided? Of course, the answer was yes: time was infinitely divided. This was because when we said that time was infinitely divided, we must be referring to a period of time. As for a " period," no matter how long it was divided, it was still a " period " and could never be divided.
Is the length of time equal to 0?
It was common to see people debating whether time was equal to 0. Then, what was time? Is its time length 0? Since time was continuous, there would definitely not be a time period with a length of time equal to 0. In fact, time was just a way for people to deal with time values. It was a man-made rule. It was a sign of the beginning or end of a time period. There was no length of time. Time was only meaningful within a period of time. A single moment did not exist and was meaningless.”
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