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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:

                          Get into pairs.

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

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

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

                          inverted position, as shown in the figure.

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

                 194                                                                                    Mathematics-3

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