OK, the first thing to do is to figure out the volume per inch of your 3 inch ID pipe. As you learned in high school geometry, you can calculate the volume of a solid such as a cylinder by multiplying its cross-sectional area by its volume. And the cross section of a cylinder is a circle, whose area is πr2. Therefore, the volume per inch of a 3 inch ID pipe is:
π(1.5)2 = 7 in3
As Russ pointed out, concrete weighs about 150 lbs/ft3. But we need to convert that to pounds per cubic inch. There are 144 cubic inches per cubic foot.
150 lb/ft3 ÷ 144 in3/ft3 = 1 lb/in3
Now we calculate how many cubic inches are required to make a 25 pound weight.
25 lb ÷ 1 lb/in3 = 25 in3
So we need 25 cubic inches of concrete per weight. And we calculated that the pipe has a volume of 7 cubic inches per linear inch. So:
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