How Things Work
Shape and floating
Find out whether the shape of a thing changes whether it floats.
Does the shape of a thing matter when it goes into water? In your book, Our Wondrous World (Chapter 7), you find out with a piece of aluminium foil, the thin shiny sheet used to wrap food.
The same piece of foil is tried in three shapes. Spread out flat, it floats. Shaped like a cup, it floats. But pressed tightly into a small ball, it sinks.
The foil is the same, and so is its weight. Only its shape has changed. So your book says that by changing the shape of an object, we can make it float or sink.
Your book also says the ball must be pressed very tightly. If it is not pressed tightly, it might even float.
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