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For example the measurement unit “metre per second” for “velocity” is specified as the product of “metre” to the power one times “second” to the power minus one.

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Source
OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
SysML keywords
Unit
DerivedUnit
A DerivedUnit is a Unit that represents a measurement unit that is defined as a product of powers of one or more other measurement units.
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For example the measurement unit “metre per second” for “velocity” is specified as the product of “metre” to the power one times “second” to the power minus one
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SysML ValueType adds an ability to carry a unit of measure and quantity kind associated with the value.
unit : InstanceSpecification [0..1] A unit, represented by an InstanceSpecification classified by a kind of SysML Unit, in terms of which the magnitudes of other quantities that have the same quantity kind can be stated.
A Unit is a quantity in terms of which the magnitudes of other quantities that have the same quantity kind can be stated.
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 ...
The only valid use of a Unit instance is to be referenced by the unit property of a ValueType stereotype.
A DerivedUnit is a Unit that represents a measurement unit that is defined as a product of powers of one or more other measurement units.
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