Editing Chemistry (section)

===Equilibrium===
{{Main|Chemical equilibrium}}

Although the concept of [[Chemical equilibrium|equilibrium]] is widely used across sciences, in the context of chemistry, it arises whenever a number of different states of the chemical composition are possible, as for example, in a mixture of several chemical compounds that can react with one another, or when a substance can be present in more than one kind of phase.

A system of chemical substances at equilibrium, even though having an unchanging composition, is most often not [[static equilibrium|static]]; molecules of the substances continue to react with one another thus giving rise to a [[dynamic equilibrium]]. Thus the concept describes the state in which the parameters such as chemical composition remain unchanged over time.