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Réalisation - Spirometer

  • Etape 1

    Cut the top end of the bottle to form a funnel.

    With the punch, drills a hole in the center of the cap.



  • Etape 2

    Insert the top of a straw through the cap.

    Cut the straw to leave approx. 10 cm outside.



  • Etape 3

    tape another straw on the side of the funnel.



  • Etape 4

    Cut a peace of 20 cm from the third straw.

     

    Fold it in half and surround the vertical straw.

     

    With adhesive tape, fix the two folded ends together .



  • Etape 5

    Using aluminium foil, form a very light ball (not very compact).

     

    The ball has to be the size of a large nut and well rounded.

     

    Place it in the funnel.



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