In the SI metric system, which unit is used to measure length?

In the SI metric system, the meter is the fundamental unit of length. It is defined as the distance light travels in a vacuum in a specific fraction of a second, which gives it a precise and universal standard. The meter serves as the base unit from which other metric units of length, such as centimeters and millimeters, are derived.

While centimeters, inches, and feet are used for measuring length, they are either smaller units within the metric system (like centimeters) or part of other measurement systems (like inches and feet in the imperial system). The meter is essential for scientific measurements and serves as the foundation for comparing lengths in a standardized way across various fields of study and applications. This is why the meter is recognized as the primary unit in the SI metric system for measuring length.