The only valid use of a Unit instance is to be referenced by the unit property of a ValueType stereotype. Source OMG Systems Modeling Language (SysML) 1.6
Two such InstanceSpecifications represent the same "measurement unit" if and only if their definitionURIs have values and their values are equal. Source OMG Systems Modeling Language (SysML) 1.6
The definitionURI of an InstanceSpecification classified by a kind of Unit identifies the particular "measurement unit" [VIM3-1.9] that the InstanceSpecification represents. Source OMG Systems Modeling Language (SysML) 1.6
Modelers specialize Unit as done in SysMLs QUDV model library or in a similar manner in other model libraries. Source OMG Systems Modeling Language (SysML) 1.6
Unit, or a specialization of it, classifies an InstanceSpecification to define a particular "measurement unit" in the sense of a "real scalar quantity, defined and adopted by convention, with which any other quantity of the same kind can be compared ... Source OMG Systems Modeling Language (SysML) 1.6
Unit is defined as a non-abstract SysML Block defined in the SysML UnitAndQuantityKind model library. Source OMG Systems Modeling Language (SysML) 1.6
A unit may also specify less stable or precise ways to express some value, such as a cost expressed in some currency, or a severity rating measured by a numerical scale. Source OMG Systems Modeling Language (SysML) 1.6
A unit often relies on precise and reproducible ways to measure the unit. For example, a unit of length such as meter may be specified as a multiple of a particular wavelength of light. Source OMG Systems Modeling Language (SysML) 1.6
A Unit is a quantity in terms of which the magnitudes of other quantities that have the same quantity kind can be stated. Source OMG Systems Modeling Language (SysML) 1.6
The only valid use of a QuantityKind instance is to be referenced by the quantityKind property of a ValueType or Unit. Source OMG Systems Modeling Language (SysML) 1.6
Two such InstanceSpecifications represent the same "kind-of-quantity" if and only if their definitionURIs have values and their values are equal. Source OMG Systems Modeling Language (SysML) 1.6
The definitionURI of an InstanceSpecification classified by a kind of QuantityKind identifies the particular "kind-of-quantity" [VIM3-1.2] that the InstanceSpecification represents. Source OMG Systems Modeling Language (SysML) 1.6
Modelers specialize QuantityKind as done in SysMLs QUDV model library or in a similar manner in other model libraries. Source OMG Systems Modeling Language (SysML) 1.6
... a SysML value property is understood to correspond to the VIM concept of "quantity" defined as a "property of a phenomenon, body or substance, where the property has a magnitude that can be expressed as a number and a reference" [VIM3-1.1]. Source OMG Systems Modeling Language (SysML) 1.6
QUDV in SysML refers to: Quantity, Unit, Dimension, Value. It is strongly influenced by the International Vocabulary of Metrology (VIM).
