Surface area to volume ratio

Change the side of a cube to see its surface area, volume and the ratio between them.

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Questions students ask

Why do large animals need lungs and guts?

As size increases, volume grows faster than surface area, so diffusion across the body surface can no longer supply all the cells.

What formula does it use?

SA:V = surface area ÷ volume; a cube of side L has 6L² ÷ L³ = 6/L.

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