Dictionary
Base quantity
A quantity in a conventionally chosen subset of a system of quantities in which no member can be expressed in terms of the others…
Global Search
Search Metrology Atlas
One query across documents (page by page), definitions, standards, questions, news, tools and training.
15 results for “Base quantity”
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…
Dictionary
Derived quantity
A quantity in a system of quantities defined in terms of the base quantities of that system — speed, force, pressure. VIM (JCGM 200:2012…
Dictionary
Quantity of dimension one
A quantity whose dimension has all base-quantity exponents equal to zero — refractive index, strain, a ratio of like quantities; often loosely called "dimensionless…
Dictionary
Quantity dimension
The expression of a quantity's dependence on the base quantities as a product of powers of their dimensions — force has dimension L·M…
Dictionary
Base unit
A measurement unit adopted by convention for a base quantity — in the SI: second, metre, kilogram, ampere, kelvin, mole, candela. VIM (JCGM 200:2012…
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
Derived unit
A measurement unit for a derived quantity, formed as a product of powers of base units — the newton (kg·m·s⁻²) or the…
Dictionary
Measurement uncertainty
A non-negative parameter characterizing the dispersion of the quantity values being attributed to a measurand, based on the information used — the quantitative expression…
Dictionary
Coverage interval
The interval containing the set of true quantity values of a measurand with a stated probability, based on available information — unlike a classical confidence…