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The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units. [2]
A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.
Also a measure of length, originally representing a person's outstretched arms. Couple: 2 A set of two of items of a type Century: 100 Primarily denotes one hundred years, but occasionally used, especially in the context of competitive racing, to refer to something consisting of one hundred, as in a 100-mile race. Dozen: 12
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement.
A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce .
Unit system Domain Derivation Unit name Unit symbol Dimension symbol Quantity name Definition In SI base units In other SI units SI: Physics: Basic: second [n 1] s: T: time: The duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. s: SI ...
Metrology – Science of measurement and its application; Non-SI units mentioned in the SI – Unit accepted for use in the International System of Units; Outline of metrology and measurement – Topical index of English Wikipedia articles about metrology and measurement; Preferred metric sizes – Metricated industry standards; Unified Code ...
Derived units are constructed from the base units, for example, the watt, i.e. the unit for power, is defined from the base units as m 2 ·kg·s −3. Other physical properties may be measured in compound units, such as material density, measured in kg/m 3 .