To characterize matter, the concept of "time" has a more abstract character than space. If we perceive space as a container of material objects and their ability to move mechanically, then by time we mean the change of events and the duration of the observed processes in space. Space can be described using mathematical apparatus and it is understandable to us from a geometric point of view (three-dimensional space). Time is a fundamental concept that has no precise definition and covers not only mechanical processes, but also biological, chemical, social, etc.
"Time" characterizes the change of states of matter from the previous to the next and how fast it happens, i.e. the speed of processes. Since matter is a system of systems, we cannot speak of any absolute time. Time flows differently in different systems: in the atom system, time flows much faster than in the human system, and in the universe system, time for humans "stops". Thus, time, like motion in space, is relative. In order to quantify time, clocks were invented. Regardless of the operating principle of the clock, this device is designed to measure the duration of processes, i.e. using a clock, you can measure the duration of processes, but you cannot measure the change of state itself.
So, time is our brain's reflection of the rate of change of matter. If processes occur at different speeds at two points in space, then the time at these points will be different. For example, a person, as an open system, changes at a certain rate, i.e. it has its own tm time, the universe has its own tu time, processes in the microcosm have - tmk, and:
As a result, for humans, the movement of microparticles is elusive and has a probabilistic character, while the movement of the universe freezes and does not change. Let's present the above in a visual way. Let's assume that at time t1 a person begins observing some process in the microcosm and the universe. At the moment t2, the observation ends. The interval t2– t1 corresponds to the minimum duration of the process that a person can notice, i.e. within this time interval, a person will see a change in an object.
Then we get the picture shown in Fig. 1:
M is a person;
U – universe;
Mk is a microcosm.
"Time" characterizes the change of states of matter from the previous to the next and how fast it happens, i.e. the speed of processes. Since matter is a system of systems, we cannot speak of any absolute time. Time flows differently in different systems: in the atom system, time flows much faster than in the human system, and in the universe system, time for humans "stops". Thus, time, like motion in space, is relative. In order to quantify time, clocks were invented. Regardless of the operating principle of the clock, this device is designed to measure the duration of processes, i.e. using a clock, you can measure the duration of processes, but you cannot measure the change of state itself.
So, time is our brain's reflection of the rate of change of matter. If processes occur at different speeds at two points in space, then the time at these points will be different. For example, a person, as an open system, changes at a certain rate, i.e. it has its own tm time, the universe has its own tu time, processes in the microcosm have - tmk, and:
tmk << tm << tu
As a result, for humans, the movement of microparticles is elusive and has a probabilistic character, while the movement of the universe freezes and does not change. Let's present the above in a visual way. Let's assume that at time t1 a person begins observing some process in the microcosm and the universe. At the moment t2, the observation ends. The interval t2– t1 corresponds to the minimum duration of the process that a person can notice, i.e. within this time interval, a person will see a change in an object.
Then we get the picture shown in Fig. 1:
M is a person;
U – universe;
Mk is a microcosm.

Fig. 1.
We see that during the observation, many changes have occurred in the microcosm, which are simply hidden to humans and they record only one last one. In the universe, change is so slow that for a given time interval, there is simply no change for a person.