A rough estimate would be fine. I need to know. Thank you very much
radius equals 2.5 nm. Volume is 4/3 pi * r^3 or 65.45 cubic nm. Copper density is 8.96 g/cm^3 or equivalenty 8.96 g/cm^3 * (1cm/10^7nm)^3 or 8.96 * 10^-21 g/nm^3. mass 8.96 * 65.45 586.4 * 10^-21 gm. In Earth's gravity of 9.81m/s^2, the weight would be .575289 * 10^-21 Newtons. This is really rough. At that size, typical volume calculations may yield incorrect results because you don't have a large number of atoms in that space. If this is for anything other than a bar bet, use a more rigorous method.
