Is there a general rule(s) that describe the stiffness of a round tubing
to the stiffness of a solid rod? For instance: is 1" dia. round rod
stiffer than 1 " dia. x .125" wall tubing? How much larger dia. tubing
equals a solid rod of a certain dia.?
Is tubing inherently stiffer because it has 2 surfaces (inside and
outside) that oppose each other? Thanks.

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