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20 pounds
A laminate shingle's weight will vary a great deal depending on its dimension and thickness. A rough estimate would be that enough shingles to cover 100 square feet would weigh around 240 pounds.
14.7 pounds per square inch
it depends on the weigh that is on the plastic. and mostly yes.
The atmospheric pressure is roughly 1 bar, or 100,000 pascal. That means 100,000 newton per square meter (equivalent to the mass of about 10 tons). Actually, that's the approximate pressure at sea level; the pressure (force or weight per square meter) varies a lot depending on the altitude.
an ounce, idiot
Weigh it on a scale.
20g
There are SO MANY kinds of 'plastic' that's an impossible question.
With a barometer.
well it depends on how many pounds of each but they both weigh the same
3 pounds