[Wikipedia] The mole fraction or molar fraction (xi) is defined as unit of the amount of a constituent (expressed in moles), ni , divided by the total amount of all constituents in a mixture (also expressed in moles), ntot.
Mole fraction
Molar fraction
Concentration
Concept
SKOS Concept
definition
A statement or formal explanation of the meaning of a concept.
is in scheme
Relates a resource (for example a concept) to a concept scheme in which it is included.
preferred label
A resource has no more than one value of skos:prefLabel per language tag, and no more than one value of skos:prefLabel without language tag.
The range of skos:prefLabel is the class of RDF plain literals.
skos:prefLabel, skos:altLabel and skos:hiddenLabel are pairwise disjoint properties.
The preferred lexical label for a resource, in a given language.
alternative label
The range of skos:altLabel is the class of RDF plain literals.
An alternative lexical label for a resource.
has broader
Broader concepts are typically rendered as parents in a concept hierarchy (tree).
Relates a concept to a concept that is more general in meaning.