Minute, which means "tiny" and abbreviated as min, can mean minutes. Min stands for minimum and minimum value; Max means the opposite, biggest and biggest. These units are often used when writing units, such as s for seconds, min for minutes and h for hours, which are often used in physics and mathematics.

The basic unit of the international system of time units is the second. Hour is an auxiliary unit of time, which is consistent with the basic unit of the international system of units. In ancient China, time was measured by the method of "dripping water from a copper pot", and day and night were divided into twelve hours. When clocks and watches were introduced to China from the west, people called an hour "striking time" in China and a new hour "striking time" in the west.

Time is an abstract concept, which shows the continuity and sequence of material movement and change. The concept of time includes two concepts: time and time period.

Time is a parameter used by human beings to describe the process of material movement or the occurrence of events. The determination of time depends on the law of material circulation that is not affected by the outside world. For example, the cycle of the moon around the earth, the cycle of the earth around the sun, the cycle of the earth's rotation, and the cycle of atomic oscillation. Einstein said that time and space are an illusion of people's cognition.