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KB Term:
Sigma KEE - PhysicalState
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physical state
The physical state of an
Object
. There are three reified instances of this
Class
:
Solid
,
Liquid
, and
Gas
. Physical changes are not characterized by the transformation of one substance into another, but rather by the change of the form (physical states) of a given substance. For example, melting an iron nail yields a substance still called iron.
Relationships
Parents
internal attribute
Any
Attribute
of an
Entity
that is an internal property of the
Entity
, e.g. its shape, its color, its fragility, etc.
Instances
gas
An
Object
has the
Attribute
of
Gas
if it has neither a fixed volume nor a fixed shape.
liquid
An
Object
has the
Attribute
of
Liquid
if it has a fixed volume but not a fixed shape.
plasma
An extremely energetic
PhysicalState
that consists of atomic nuclei stripped of electrons. That is, a plasma is composed of positive ions and free electrons.
Plasma
behaves differently enough from
Gas
that it is referred to as the fourth state of matter.
solid
An
Object
has the
Attribute
of
Solid
if it has a fixed shape and a fixed volume.
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Sigma version 3.0 is
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produced by
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and its partners