According to SI units, what is the unit for time?

According to SI units, what is the unit for time?

• A. hour
• B. minute
• C. second
• D. day

Answer: (C)

The correct unit for time in the International System of Units (SI) is the second. The second is defined based on the properties of atomic clocks and is a fundamental unit that provides a consistent measure of time. It serves as the base unit from which other measures of time, including minutes, hours, and days, can be derived. While hours, minutes, and days are commonly used in everyday life, they are not part of the SI base units. Instead, they are defined as follows: one minute is equal to 60 seconds, one hour is equal to 60 minutes, and one day is equal to 24 hours. Therefore, all these larger units can be expressed in terms of seconds, highlighting why the second is the primary unit recognized in the SI system for measuring time.

The correct unit for time in the International System of Units (SI) is the second. The second is defined based on the properties of atomic clocks and is a fundamental unit that provides a consistent measure of time. It serves as the base unit from which other measures of time, including minutes, hours, and days, can be derived.

While hours, minutes, and days are commonly used in everyday life, they are not part of the SI base units. Instead, they are defined as follows: one minute is equal to 60 seconds, one hour is equal to 60 minutes, and one day is equal to 24 hours. Therefore, all these larger units can be expressed in terms of seconds, highlighting why the second is the primary unit recognized in the SI system for measuring time.