18kt refers to the gold content of the necklace material, and 18 inch is the length. Without knowing what the link size is and the gauge of the material it is impossible to know the weight.
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Meant to say "half inch Proof Coil vs half inch size BBB" anchor chain.
That would also depend on the thickness of that square inch!
its 10000kg
Of course, different brasses and forms can vary, but at a specific gravity of about 8.5, a cubic inch of brass would weigh about 5 ounces (or just under a third of a pound).
It depends on the material as well as the force of gravity.