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When made out of cardboard? About ten kilos.
Use some standard of cardboard wt. per square ft, as a box has six sides, you have (length x width + length x height + width x height) x 2 x lb/ sq ft or if in metric kg/ sq m. Get net weight by subtracting cardboard wt from box wt. One standard cardboard box wt. in US is 0.13 kg/ sq m. This number will vary in US and, may be quite different in other countries.
A square foot of Plexiglas can hold no water. It is a flat sheet. A cube of Plexiglas would be needed.
it can't hold very much weight
what is the weight of a 10 foot big six asbestos sheet
20 times its weight in liquid
112lbs
it can hold as much weight as it can handle
There is effectively no limit to the amount of weight that aluminum can hold, if you use enough aluminum.
A triangle is a shape. How much weight a triangularly shaped object could hold would depend on the nature of the object.
From what I can find a dry king sheet weighs about 2 lbs.
it can hold up to 2 gallons