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Question
Why do suspended particles settle in muddy water over time but not in milk?
Short Answer
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Solution
A suspension is muddy water. Large and visible to the naked eye, its particles are sufficiently weighty to settle if left undisturbed.
A colloid is milk. Its particles stay evenly distributed throughout the mixture and are significantly smaller than those in a suspension. As a result, when milk is left to stand, the particles do not easily settle.
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