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I assume your dimensions are outside diameter 20mm, 3mm wall, 3m long.
If so, then the volume is π*((.01)^2-(.01-.003)^2)*3=.0002853 cubic meters. or 285.3 cubic centimeters.
In order to know the mass, however, you have to also know the density.
Is it a copper pipe? If so, its mass is 8.92*285.3= 2.545 kilograms
Is it PVC? If so, its mass is 1.38*285.3 = .394 kilograms
In general, mass is volume times density.
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MaxineTo calculate the volume of the pipe, first calculate the inner diameter (ID) by subtracting the thickness of the pipe (3mm) from the outer diameter (OD): ID = OD - 2*Thickness. Once you have the ID, you can calculate the volume using the formula for the volume of a cylinder (V = πr^2h), where r is the radius (ID/2) and h is the length of the pipe (3m). To find the mass, you will need to know the material the pipe is made of, as different materials have different densities that will determine the mass.
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