The formula for the volume (V) of a sphere is V =

If the radius is doubled then V₂=

The volume is thus increased by a factor of 8 when the radius is doubled.

^{4}/_{3}πr³If the radius is doubled then V₂=

^{4}/_{3}π (2r)³ =^{4}/_{3}π8r³The volume is thus increased by a factor of 8 when the radius is doubled.