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72 units
Like 3D. Looks like you can hold it. It's not flat
A square foot is not going to hold any water, because it's flat. You need a cubic measurements for volume.
Most companies use weight to measure how much a diaper can hold. Weigh it before and after then subtract the weight before from the weight after.
Think of surface area as your skin and volume as all the contents inside your body. So they relate because surface area can hold volume or volume could be inside the surface area.