hour
An hour is a unit of time. The hour is not the basic unit of the international system of time units (the basic unit of the international system of time units is seconds), but an auxiliary unit of time coordinated with the basic unit of the international system of units. Except leap second, one hour is generally equal to 3600 seconds, or 60 minutes, or 1/24 days. "H" is often used in English or mathematics.
minute
Minutes, also called minutes, are units of time. Minute is English, which means "tiny" and also means min. Engraving = 15 minutes, word =5 minutes (usage in southern Fujian and Guangdong).
second
Seconds is the basic unit of time in the international system of units, with the symbol S, sometimes marked with English abbreviations as sec.
Extended data:
In ancient times, time (big time) was not counted by 1234, but marked by ugly children and animals such as rats, cows, tigers and rabbits, which was easy to remember. The specific division of labor is as follows:
Child (mouse) is 23:00- 1:00, with zero as the punctuality;
Ugly (cattle) from one to three, with two points as the punctuality;
Yin (tiger) is from three o'clock to five o'clock, with four o'clock as the punctuality;
Mao (rabbit) is from five to seven, with six o'clock as the punctuality;
Chen (Dragon) is from 7: 00 to 9: 00, with 8: 00 as the punctuality;
It's 9 o'clock to 1 1, and 10 is the punctuality;
Noon (horse) is from eleven to thirteen, with twelve o'clock as the punctuality;
When not (sheep), it is from 13: 00 to 15: 00, with 14: 00 as the punctuality;
When the application (monkey) is 15 to 17, 16 is the punctuality;
From 17: 00 to 19: 00, 18: 00 is the punctuality;
From 19: 00 to 2 1: 00, 20: 00 is the punctuality;
The morning of the pig is from 2 1: 00 to 23: 00, and 22: 00 is the punctuality.
References:
Time unit-Baidu Encyclopedia