EN9 Round Bar Weight Formula

For weight per foot of round bar, multiply the density (about 0.285 lb/in³ for 304, and about 0.283 lb/in³ for EN9) by 12 πr². 'r' is the radius of the bar in inches.

Weight times volume gives the density of any material.

THAT AIN'T ROCKET SCIENCE.

Weight divided by volume = density (as I'm sure you know). What he needs is weight = volume times density

Yep, I meant to say volume x density.

Wasn't paying attention to the inane question anyway.

The funny thing (aside from your amusing foray into rocket surgery/ brain science) is that the OP isn't asking for weight, density, or volume. The answer has the same units as surface tension.

Why the shouting?

_{Pssssssst! Look it up in Kempe's Engineers' Yearbook, any edition!}

Weight per unit length of EN9 steel round bar

Density = 490 lbf/ft³ OR 0,284 lbf/in³

Volume = πd²/4 x L ['d' is the bar's diameter: L is its length

Weight per unit length of stainless steel grade 304L

Density = 500 lbf/ft³ OR 0,289 lbf/in³

Volume = π.(D²-d²)/4 x L ['D' is the pipe's external diameter: 'd' is the internal diameter: L is the length

I leave it up you, A.P. No1 to figure out the rest.

Since we are not making Swiss watches here, the densities are sufficiently accurate.

A.P. No1: Do not pay any attention to these Philistines of the engineering world; they have their heads so far up their own southward-pointing orifices, they have forgotten - or display the like - that they too had to start at the beginning knowing bugger-all.