The conversion formula of hours, minutes and seconds: 1 hour =60 minutes, 1 minute =60 seconds, 1 hour =3600 seconds.

1 international second is equivalent to 1/60 minutes and 1/3600 hours.

Time unit second is the basic unit of time in the international system of units, with the symbol S, sometimes marked with the English abbreviation sec.

Definition of second: the period of electromagnetic wave radiated when 9 192, 63 1, 770 times cesium 133 atomic ground state transitions. The cesium atom mentioned in this definition must be stationary at absolute zero, and its environment is zero magnetic field.

Mathematically, the conversion between these units can be calculated by using basic multiplication and division. For example, if we want to convert minutes into hours, we can divide minutes by 60 to get hours; On the contrary, if we want to convert hours into minutes, we can multiply hours by 60 to get minutes. Similarly, we can also convert seconds into minutes or hours.

Extended data:

After the Han dynasty, "time" no longer represents the season, but is used to represent the unit of calculating time. At that time, people divided a day into 12 hours on average, and "one hour" was equal to two hours now. People are used to calling this "hour". In some classical books, we often see the word "time". Many people mistakenly think that an hour is an hour now, which is actually incorrect. The ancient word "night watch" and "night watch" refers to time, and there are two hours between the first watch and the second watch and the third watch.

Later, people divided the day into 24 parts on average, and each part was still expressed by "time". At this time, "a moment" is an hour now, only half of the past (after the Han Dynasty), and the time referred to is shortened. Then, people divide an hour into 60 equal parts, each time called 1 minute, and divide 1 minute into 60 equal parts, each time called 1 second. This determines the hours, minutes and seconds.