If you are looking for the weight of limestone for 6 inches x 3 feet x 3 feet, that will be ABOUT 459 pounds. Limestone aggregate is roughly 2700 pounds per cubic yard.
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4102.6lbs per square inch
250 pounds per square inch (PSI)
You can't say 'pressure per square inch. It's just 'pressure', which equals force per square inch. You divide the person's weight by the area of the foot in contact with the stairs to get the answer.
1 yard of 1" crushed stone
turn inch into a cent ameter's and lanth time weight