<P> In chemistry, a suspension is a heterogeneous mixture that contains solid particles sufficiently large for sedimentation . The particles may be visible to the naked eye, usually must be larger than 1 micrometer, and will eventually settle . A suspension is a heterogeneous mixture in which the solute particles do not dissolve, but get suspended throughout the bulk of the solvent, left floating around freely in the medium . The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain excipients or suspending agents . An example of a suspension would be sand in water . The suspended particles are visible under a microscope and will settle over time if left undisturbed . This distinguishes a suspension from a colloid, in which the suspended particles are smaller and do not settle . Colloids and suspensions are different from solution, in which the dissolved substance (solute) does not exist as a solid, and solvent and solute are homogeneously mixed . </P> <P> A suspension of liquid droplets or fine solid particles in a gas is called an aerosol . In the atmosphere, the suspended particles are called particulates and consist of fine dust and soot particles, sea salt, biogenic and volcanogenic sulfates, nitrates, and cloud droplets . </P>

How are the particles in a suspension different from those in a solution
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