SWEET Ontology
type: Ontology
version info: 2.3
imports: stateRole.owl
imports: rela.owl
imports: statePhysical.owl
imports: state.owl

Chemical
type: Class
subclass of: Substance
equivalent class: ChemicalSubstance
comment: Chemical substance, in chemistry, are material objects that can undergo various transformations related to artificial or natural phenomena [Wikipedia]

Mixture
type: Class
subclass of: ChemicalSubstance
equivalent class: MixedChemicalSubstance
comment: In chemistry, a mixture is when two or more different substances are mixed together but not combined chemically. The molecules of two or more different substances are mixed in the form of solutions, suspensions, and colloids. [Wikipedia]

Solution
type: Class
subclass of: Mixture
comment: In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent. All solutions are characterized by interactions between the solvent phase and solute molecules or ions that result in a net decrease in free energy. [Wikipedia]