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CBSE Class 9 Answered

air consist of small percentage of dust and watervapour and thus allows beam of light to scatter through it.
so then why it is called a solution?it should be called a colloid?
Asked by vrishti TOKAS | 11 Jun, 2015, 11:06: AM
answered-by-expert Expert Answer

The air is composed of many tiny particles including dust and water vapour. Air scatters a small visible region of light whereas colloidal solution scatters different range of light wavelength.

For example if we take laser beam, then it won’t get scattered in air whereas colloidal solution scatters the laser beam.

So visible region is just an exception to the Tyndall effect in case of air otherwise it is considered as solution.
Answered by Arvind Diwale | 12 Jun, 2015, 01:14: PM

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