Dictionary
Coherent system of units
A system of units in which every derived unit is coherent — the SI as used with its base and coherent derived units. VIM (JCGM…
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45 results for “System of units”
Dictionary
Off-system measurement unit
A unit that does not belong to the system of units in use — the day, the electronvolt, and the nautical mile relative to the…
Dictionary
System of units
A set of base and derived units, with their multiples and submultiples, defined under given rules for a given system of quantities. VIM (JCGM…
Dictionary
International System of Units (SI)
The system of units based on the ISQ, with unit names, symbols, prefixes, and rules for their use, adopted by the CGPM. Since the…
The practical style guide for using SI units, symbols, and conversion factors in US practice. Freely available. NIST Standards & Units
The US edition of the SI Brochure reflecting the 2019 redefinition in which all seven base units derive from fixed defining constants. Freely available…
Dictionary
System of quantities
A set of quantities together with the non-contradictory equations relating them — the framework a system of units is built on. VIM (JCGM 200…
Dictionary
International System of Quantities (ISQ)
The system of quantities based on the seven base quantities: length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity — the…
Documents
GMP 13 — Ensuring Traceability
…The primary national, international or intrinsic standards must be primary standards for the realization of the International System of Units (SI) (See GMP 13…
Dictionary
Derived quantity
…system of quantities defined in terms of the base quantities of that system — speed, force, pressure. VIM (JCGM 200:2012) 1.5 Standards & Units