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Sigma KEE  MassMeasure
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mass measure
A
subclass
of
ConstantQuantity
, instances of which are measures of the amount of matter in an
Object
.
Relationships
Parents
constant quantity
A
ConstantQuantity
is a
PhysicalQuantity
that has a constant value, e.g. 3
Meter
s and 5
HourDuration
s. The magnitude (see
MagnitudeFn
) of every
ConstantQuantity
is a
RealNumber
.
ConstantQuantity
is distinguished from
FunctionQuantity
, in that each instance of the latter is formed through the mapping of one
PhysicalQuantity
to another
PhysicalQuantity
. Each instance of
ConstantQuantity
is expressed with the
BinaryFunction
MeasureFn
, which takes a
Number
and a
UnitOfMeasure
as arguments. For example, 3
Meter
s is expressed as (
MeasureFn
3
Meter
). Instances of
ConstantQuantity
form a partial order (see
PartialOrderingRelation
) with the
lessThan
relation, since
lessThan
is a
RelationExtendedToQuantities
and
lessThan
is defined over the
RealNumber
s. The
lessThan
relation is not a total order (see
TotalOrderingRelation
) over the class
ConstantQuantity
since elements of some subclasses of
ConstantQuantity
(such as length quantities) are incomparable to elements of other subclasses of
ConstantQuantity
(such as mass quantities).
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