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Surface area is the amount of cell membrane available for diffusion. So for a cell, surface area actually represents how much diffusion that can happen at one time. Whereas volume is the amount of cytoplasm contained within the cell membrane.So for a cell, volume is how long It takes to get from the membrane to the center of the cell by diffusion. Therefore, to perform diffusion efficiently, there must be an adequate ratio between the cellâs surface area and its volume.o for a cell, surface area actually represents how much diffusion that can happen at one time. Whereas volume is the amount of cytoplasm contained within the cell membrane. So for a cell, volume is how long It takes to get from the membrane to the center of the cell by diffusion.
So generally, the relationship between the rate of diffusion and cell size is that the rate of diffusion stays the same, but as all the cells are small, diffusion occurs quicker throughout the cells, than in larger cells.xtracts from this document... Introduction. Investigating the relationship between cell size and rate of diffusion Aim: To plan and carry out an investigation to show the relationship between volume, surface area, and diffusion; and to demonstrate, using diffusion, why the size of cells is limited.