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The weight of one square foot of water is zero pounds. A square foot is a measurement of area, not volume. Since a square foot has no height, it is not possible to fit even a single hydrogen atom...
Depends what the "ply" value is ... the number of layers glued together. For instance, 1/2" plywood is going to be lighter then 3/4" plywood.
A common rule of thumb is a 4x8 foot sheet of 1/4" fir...