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Diameter.
pi * r2 * l3,14159 *2.542 * 500 = 10134 cubic centimeters = 10 liters
Assuming it is a rod, the difficulty lies in that it can't measure the diameter of the beaker. Unless you were to attempt to find out the Radius/Diameter, then work out the circumference from that.
The weight of 1 foot of steel rod would depend on the diameter of the rod.
Cubic inches = pi*r^2*L wherer = radius of rod = 1/2*diameter and L = length, both measured in inches.