A heterogeneous mixture is a combination of two or more substances where the components remain distinct and can be easily identified. The composition is not uniform throughout.
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The individual substances in a heterogeneous mixture retain their own properties.
Examples include salad, sand and iron filings, and oil and water mixtures.
Heterogeneous mixtures can be separated by physical means such as filtration or decanting.
The phases of the substances in a heterogeneous mixture are often visibly distinguishable.
Heterogeneous mixtures do not have a fixed composition; the ratio of components can vary.