None.
A millimetre is a measure of length or distance in 1-dimensional space and bears no relation to an area which is a measure in 2-dimensional space, nor to a volume which is a measure in 3-dimensional space. The three measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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1mm cube has volume of 1mm3 and a surface area of 6*(1*1) = 6mm²2mm cube has a volume of 8mm3 and a surface area of 6(2*2)=24mm²Ratio for 1mm cube is 6-1 and ratio for 2mm cube is 3-1 ■
To obtain the ratio of surface area to volume, divide the surface area by the volume.
surface area/ volume. wider range of surface area to volume is better for cells.
Volume=area * length of that surface
surface area divided by volume