What is Suspension? - QS Study
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Suspension is a heterogeneous mixture of solid particles in liquid where the size of the particle is larger than 1 μm. That is why, panicles exist in suspension are able to precipitate. Suspension consist of two phase external & internal. External phase is solid or gas phase and internal phase is solid.

The particles in suspension are easily visible by microscope e.g. sand mixed with water is a suspension