100 pounds per square foot (also denoted 100 psf) is most likely a pressure value. Think of it as having a block of steel 1 ft by 1 ft, weight of 100 pounds, and placing it on a flat surface. The pressure on the flat surface from the block of steel equally distributed over the 1 square foot area is 100 psf.
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Pounds per square foot x 0.006944 equals psi
There are 55,000 foot-pounds per second in 100 horsepower.
Gypsum or plaster board3 3/8 inch 1.56 pounds per square foot 1/2 inch 2.08 pounds per square foot 5/8 inch 2.60 pounds per square foot
Yes, the floor is designed for 100 pounds per square foot over the whole area. So if the room is 10 feet by 10 feet it can take 100 x 10 x 10 = 10,000 pounds, or if a person weighing 200 pounds occupies 2 square feet then it can support 10000/2/200 = 50 people at one time in that room
The price appears to be 29 per square foot. Since there are 100 square feet in a 10 x 10 area, the total would be 2900.