depends on length
as much as ceramic or porcelain tiles
A 2x12x12 foot board would not be measured in square feet but cubic feet and there would be 240 feet3
I don't know but I would like to know. Get a life.
That depends on how well supported the floor is and that depends on how far apart the joists are placed. The closer they are, the more weight can be supported.
About 20 pounds
112lbs
it can hold as much weight as it can handle
A Command Strip can typically hold up to 7.5 pounds of weight.
it can hold up to 2 gallons
Paper can hold exactly 4.5 kg
Gorilla Super Glue can hold up to 30 pounds of weight.
The Golden Gate Bridge can hold up to 38,000 tons of weight.
90lbs
120 pounds
1.683 grams
About 50,000 lb.