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   ocr: COLLOIDS AND EMULSIONS N. A COLLOID, particles ofone Fat globule Water substance are dispersed throughout another. The dispersed particles are larger than those of a solution but smaller than those of a suspension. Examples ofcolloids include milk (solid in liquid), mist liquid in gas), and foam (gas in liquid). Ifthe substances in a colloid are both liquids, the mixture is known as an emulsion. To prevent the liquids from separating, another substance, called an emulsifier, is often required. Mayonnaise, for example, is an together emulsion by of oil eggyolk. and vinegar held The The milk (ab ...