1. Uniform Composition: Homogeneous mixtures have a uniform composition throughout. The ratio of the components is the same in every part of the mixture.

2. Single Phase: Homogeneous mixtures exist in a single phase, meaning they have a uniform physical appearance and no visible boundaries between different components.

3. Particles Not Separable by Physical Means: The components of a homogeneous mixture are so thoroughly mixed that they cannot be separated by physical means such as filtration or sedimentation.

Examples: Salt dissolved in water (saltwater), sugar dissolved in water (sugar water), alloys such as bronze (copper and tin).

Heterogeneous Mixtures:

1. Non-Uniform Composition: Heterogeneous mixtures have a non-uniform composition. The ratio of the components can vary in different parts of the mixture.

2. Multiple Phases: Heterogeneous mixtures consist of multiple phases, meaning they have distinct physical appearances and boundaries between different components.

3. Particles Separable by Physical Means: The components of a heterogeneous mixture can be separated by physical means such as filtration, sedimentation, or centrifugation.

Examples: Sand and water mixture, oil and water mixture, granite (mixture of minerals).

The main difference between homogeneous and heterogeneous mixtures lies in their uniformity. Homogeneous mixtures have a uniform composition and exist in a single phase, while heterogeneous mixtures have a non-uniform composition and consist of multiple phases.