The ratio of the surface area of a cube to its volume
is inversely proportional to the length of its side.
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The higher the ratio, the faster the rate of diffusion
The larger the surface area to volume ratio of a cell, the smaller its size (and vice versa).
There is no direct relationship between the two. The ratio depends on the relative measures.
As size increases, the s/v ratio decreases-- the s/v ratio of a cubic cell 1mm on a side is 6, but the s/v ratio of a cubic cell 3mm on a side is only 2.
A 'ratio' shows a relationship between two numbers. There's no such thing as the ratio of one single number.