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E:\Working\Focus_Learning\Math_Genius_3_(11-09-2024)\Open_Files\CHAP_10
             \ 11-Sep-2024               Surender Prajapati   Proof-5                     Reader’s Sign _______________________ Date __________



                                   Learning by Doing




              Objective: To make a sand clock.

              Materials required: Two plastic-bottles, sand, aluminium foil, a marker,
              stands

              Procedure:

                     Š Get into pairs.

                     Š Take a plastic bottle and fill it with dry and fine sand.

                     Š Cover its mouth with aluminium foil.
                     Š Make a very small hole in the foil.

                     Š Now, place the bottle filled with sand on the other bottle in the

                      inverted position, as shown in the figure.

                     Š Note and mark the sand levels at suitable interval, say 5 minutes.
                     Š Record the time when the inverted bottle becomes empty.



















































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