Heterogeneous substance

Definition

A heterogeneous substance is a material composed of different components that are not uniformly distributed. In fluid mechanics, it refers to fluids or mixtures where the composition varies at different points.

5 Must Know Facts For Your Next Test

1. Heterogeneous substances can include mixtures of liquids with solids, immiscible liquids, or gases with suspended particles.
2. The properties such as density and pressure in a heterogeneous substance can vary spatially within the material.
3. Analyzing fluid flow in heterogeneous substances often requires more complex models compared to homogeneous fluids.
4. Common examples in physics include muddy water, emulsions, and aerosols.
5. In calculations involving heterogeneous fluids, assumptions of uniformity cannot be applied; local measurements are necessary.

Review Questions

• What distinguishes a heterogeneous substance from a homogeneous one in terms of composition?
• Why can't uniform density be assumed when dealing with heterogeneous substances?
• Give two examples of heterogeneous substances and explain why they fall into this category.

Related terms

Homogeneous Substance: A material with uniform composition and properties throughout its volume.

Density:

A measure of mass per unit volume, which can vary locally in heterogeneous substances.

Immiscible Fluids: Two or more liquids that do not mix to form a single phase, often forming layers when combined.