homogeneity

References

homogeneity

chemistry and physics

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

June 29, 2026

Quick Summary

In chemistry and physics, homogeneity refers to the quality or state of being uniform in structure or composition throughout. This concept is fundamental to understanding homogeneous reactions, which occur within a single phase, whether gaseous, liquid, or solid.12

A key example of homogeneity is a solution, defined as a homogeneous mixture of two or more substances where the proportions can vary. Air, a mixture of gases, and brass, an alloy of copper and zinc, are common examples of solutions. In homogeneous catalysis, the catalyst exists in the same phase as the reactants, facilitating reactions in gases or liquids. This uniformity simplifies the study of chemical changes, as they depend solely on the interactions between the reacting substances.342

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

6 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

rock
Texture
…are the rock’s extent of homogeneity (i.e., uniformity of composition throughout) and the degree of isotropy. The latter is the extent to which the bulk structure and composition are the same in all directions in the rock.
Read More
…are the rock’s extent of homogeneity (i.e., uniformity of composition throughout) and the degree of isotropy. The latter is the extent to which the bulk structure and composition are the same in all directions in the rock.
Read More

mineral
Definition
By its definition as a homogeneous solid, a mineral is composed of a single solid substance of uniform composition that cannot be physically separated into simpler chemical compounds. Homogeneity is determined relative to the scale on which it is defined. A specimen that appears homogeneous to the unaided eye, for…
Read More
By its definition as a homogeneous solid, a mineral is composed of a single solid substance of uniform composition that cannot be physically separated into simpler chemical compounds. Homogeneity is determined relative to the scale on which it is defined. A specimen that appears homogeneous to the unaided eye, for…
Read More

advanced ceramics
Chemical routes to precursors
…for electroceramic applications, is chemical homogeneity—that is, the establishment of uniform chemical composition throughout the mixture. Standard solid-state techniques for processing separate precursor powders can approach homogeneity in the final product only after many grinding and firing steps. A number of chemical approaches therefore have been developed in order to…
Read More
…for electroceramic applications, is chemical homogeneity—that is, the establishment of uniform chemical composition throughout the mixture. Standard solid-state techniques for processing separate precursor powders can approach homogeneity in the final product only after many grinding and firing steps. A number of chemical approaches therefore have been developed in order to…
Read More

cosmology
Einstein’s model
…suppose that the universe is homogeneous and isotropic in the large (i.e., the same everywhere on average at any instant in time), an assumption that the English astrophysicist Edward A. Milne later elevated to an entire philosophical outlook by naming it the cosmological principle. Given the success of the Copernican…
Read More
…suppose that the universe is homogeneous and isotropic in the large (i.e., the same everywhere on average at any instant in time), an assumption that the English astrophysicist Edward A. Milne later elevated to an entire philosophical outlook by naming it the cosmological principle. Given the success of the Copernican…
Read More

mechanics
Lagrange’s and Hamilton’s equations
…on direction in space) and homogeneous (H does not change with uniform translation in space), then Hamilton’s equations immediately yield the laws of conservation of angular momentum and linear momentum, respectively.
Read More
…on direction in space) and homogeneous (H does not change with uniform translation in space), then Hamilton’s equations immediately yield the laws of conservation of angular momentum and linear momentum, respectively.
Read More