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Is Matter Around Us Pure? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?5 Marks
Question
Define the following:
  1. Sol
  2. Aerosol
  3. Emulsion
  4. Foam
Given one example of each.
✓

Answer

  1. Sol: Sol is a colloid in which tiny solid particles are dispersed in a liquid medium.
Examples are ink and soap solution.
  1. Aerosol: Aerosol is a colloid in which a solid or liquid is dispersed in a gas.
Examples are hairspray and fog.
  1. Emulsion: An emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it.
Examples are milk and butter.
  1. Foam: A foam is a colloid in which a gas is dispersed in a liquid medium.
Examples are soap bubbles and shaving cream.

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