I forgot my password.
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a quick formula for :
Weight of copper (if dia known in mm)
weight of aluminium (if dia known in mm)
weight of a tube
material HDPE ( if wall thickness known)
Volume X density of material.
That won't work
How's the OP supposed to get "Volume" without knowing how to work out the area of a circle, or having, or assigning, a length?
Sheesh!