The more "regular" a shape is (meaning similar dimensions in each direction) the lower the surface area to volume ratio is. The perfect sphere has the smallest ratio of all, and the cube has the lowest ratio of any 6-sided flat-faced (box) shape.
As an object is stretched or elongated in any direction relative to the other directions, such as a torpedo shape, the enclosed volume reduces while the surface area increases, so the ratio increases rapidly.
As an object is stretched or elongated in any direction relative to the other directions, such as a torpedo shape, the enclosed volume reduces while the surface area increases, so the ratio increases rapidly.
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The sphere has the smallest ratio of surface area to volume of any solid shape.