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  UnitOfMeasure

Sigma KEE - UnitOfMeasure
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
测量单位
这是某些量䋞的量度标准。例如:MeterInch 是长度的 UnitOfMeasureUnitOfMeasure 没有令它原始和基本的固有性质, 反而一个单位制(例如: SystemeInternationalUnit)可决定一组的正交维度,并给每一个维度分配单位。
Relationships      
Parents 物理量 A PhysicalQuantity is a measure of some quantifiable aspect of the modeled world, such as 'the earth's diameter' (a constant length) and 'the stress in a loaded deformable solid' (a measure of stress, which is a function of three spatial coordinates). Every PhysicalQuantity is either a ConstantQuantity or FunctionQuantity. Instances of ConstantQuantity are dependent on a UnitOfMeasure, while instances of FunctionQuantity are Functions that map instances of ConstantQuantity to other instances of ConstantQuantity (e.g., a TimeDependentQuantity is a FunctionQuantity). Although the name and definition of PhysicalQuantity is borrowed from physics, a PhysicalQuantity need not be material. Aside from the dimensions of length, time, velocity, etc., nonphysical dimensions such as currency are also possible. Accordingly, amounts of money would be instances of PhysicalQuantity. A PhysicalQuantity is distinguished from a pure Number by the fact that the former is associated with a dimension of measurement.
Children AcidityMeasure
 CompositeUnitOfMeasureInstances of this Class are UnitsOfMeasure defined by the functional composition of other units, each of which might be a CompositeUnitOfMeasure or a NonCompositeUnitOfMeasure.
 NonCompositeUnitOfMeasureInstances of this Class are UnitsOfMeasure that are applied to a single dimension, and so are not intrinsically defined by the functional composition of other units.
 SoundPressureLevelUnitThe Class of all UnitOfMeasure that measure a sound pressure level.
 国际单位制The Class of Systeme International (SI) units.


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