SWEET Ontology
type: Ontology
version info: 2.3
imports: procPhysical.owl
imports: stateSystem.owl
imports: statePhysical.owl
imports: relaPhysical.owl

State Change
type: Class
subclass of: PhysicalProcess
equivalent class: PhaseTransition
subclass of: Restriction
  on property: from
  all values from: StateOfMatter
subclass of: Restriction
  on property: to
  all values from: StateOfMatter
comment: change of state by state variable change

Vaporization
type: Class
subclass of: State Change
subclass of: Restriction
  on property: from
  has value: Liquid
subclass of: Restriction
  on property: to
  has value: Gas
comment: The physical process by which a liquid is transformed to the gaseous state; the opposite of condensation.

Freezing
type: Class
subclass of: State Change
subclass of: Restriction
  on property: from
  has value: Liquid
subclass of: Restriction
  on property: to
  has value: Solid
comment: The phase transition of a substance passing from the liquid to the solid state; solidification; the opposite of fusion.

Ionization
type: Class
subclass of: State Change
subclass of: Restriction
  on property: to
  has value: IonizedState
comment: Ionization is the physical process of converting an atom or molecule into an ion by changing the difference between the number of protons and electrons. This process works slightly differently depending on whether an ion with a positive or a negative electric charge is being produced. A positive electric charge is produced when an electron bond to an atom or molecule absorbs enough energy from an external source to escape from the electric potential barrier that originally confined it, where the amount of energy required is called the Ionization potential. A negative electric charge is produced when a free electron collides with an atom and is subsequently caught inside the electric potential barrier, releasing any excess energy.