Question

why do the shape and size of a balloon change when filed with air or water

Answer 1

when you blow air or fill the balloon with water it occupies some space and in order to occupy even more space it pushes the walls of the balloon outward at all sides. The balloon due to its rubber composition expands as much as it can and when the pressure applied extends the limit..it get burst.
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Answer 2

the shape and size of a balloon changes when filled with air or water because balloons contain spaces between them which is used to fill by those water and air.

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