1/length
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The volume cannot be 1 centimetre since that is not an appropriate unit for measuring volume.
The ratio is 0.6 per unit of length.
A cell's volume is the amount of material that can fit into the cell. A cell's surface area is the total amount of material that makes up the outside of the cell. The ratio of surface area to volume is the amount of surface area per unit volume of an object or collection of objects.
It doesn't matter what the unit of measurement is, or what size the cube is. If the length of the side of the cube is 'S' units, then the volume is S3 and the surface area is 6S2. The ratio of volume to surface area is (S3/6S2) = S/6 units. For this one, the ratio is 1/6 cm.
Any living thing that has a low surface area per unit of volume will lose less moisture to evaporation than a living thing with a high surface area to volume ratio.