Russ says concrete is 150 lbs per cu ft. You want 25 lbs so that is 1/6 of a cu ft.
Now we need to figure the volume of your pipe per inch. Radius x radius x height x pie 1.5 x 1.5 x 1 x 3.14 = 7.065 So you have 7.065 cu in per inch of pipe.
1728 cu inches in a cubic foot and you need 1/6 1728 / 6 = 288 cu inches
So you need 288 cu inches to make 25 lbs and your pipe holds 7.065 cu inches per inch. 288 / 7.065 = 40.764 So your pipe needs to be 40.764 inches long or just over 40 3/4 inches.
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