The volume increases by 8 times (23).
doubling is 2, so its 2 to the power of 3.
Leigh
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If the other dimensions (length and height) are left unchanged, doubling the width will double the volume.
They both have the same effect on the surface area of the pipe, but the radius has more effect on its volume/capacity.
No volume is for 3 dimensional shapes and area for two dimensions.
You cannot. It could be a long narrow prism or a short squat one and the volume alone does not tell you which one of these shapes - or something in between - the prism has.
It doubles it.