Material which will float and make sink other in water

A ball like structure which will float in water , and such 4 -5 balls make box sink provided box alone will also float in water, may be with some air inside it.
what kind of material should i use?
and
what can be their weight or dimension.

Replies

  • Ramani Aswath
    Ramani Aswath
    Make a shoe box sized box with a water tight lid with enough weight to make it just float. Tennis balls float on water. However if you put a few of these inside the box, their added weight will make the box sink.
  • khbr
    khbr
    thanks for answer.
    i need smaller and little more practical model.

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