Page 1 - 3-Lesson Notes-Water Vapour, Dust and Smoke
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SAI INTERNATIONAL SCHOOL
                                                      Class - VI
                                               Subject - Chemistry
                                              Topic – Air Around Us
                Sub-Topic – Composition Of Air – Water Vapour, Dust, And Smoke

                                                   Lesson Notes


               Water Vapour

               ❖  We know that water evaporates from the surface of the water bodies and forms
                   water vapour.
               ❖  The composition of water vapour varies from place to place, region to region, and
                   season to season. For example, the concentration of water vapour is more in
                   coastal regions.
               ❖  Coastal places such as Chennai and Mumbai have more water vapour in the air,
                   whereas places such as Rajasthan have a lesser amount of water vapour in the
                   air.
               ❖  Presence of water vapour is more during the monsoon season.
               ❖  The amount of water vapour present in the air is known as humidity. The
                   presence of water vapour in the air is important for the continuation of the water
                   cycle in nature.


               Water Cycle
          The water cycle shows the continuous movement of water within the earth and the
          atmosphere. Liquid water evaporates into water vapour rises and condenses to form
          clouds, and precipitates back to earth in the form of rain and snow.





























          Activity –

          To show that air contains water vapour.

          Materials Required – a glass tumbler, ice, tray.



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