The metric system has seven base units from which all other units are derived.
Length- metre m
Time- second s
Temperature- kelvin K
Mass- kilogram kg
Electric current- ampere A
Luminous intensity- candela cd
Amount of substance- mole mol.
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No, not all metric units are part of the International System of Units (SI). The SI is a coherent system of units derived from the metric system, but it is more specific and defined, and not all metric units are included in the SI.
The base unit of length in the metric system is the meter (m). Other common units of length in the metric system include centimeter (cm) and kilometer (km).
The "metric system", more precisely the SI, has lots of units, depending on what you want to measure. Check the Wikipedia article on "SI units" for a list.
There are many systems. A system is a collection of units which are used together. The two commonest are the SI units, based on the metric system, and imperial units (feet, pounds etc.)
Metric is considered more practical than customary units because it is based on powers of ten, which makes conversions between units easier. Metric units are also used universally across most countries, making it easier to communicate measurements internationally. Additionally, the metric system is more consistent and logical in its base units compared to the various units and systems used in the customary system.