Someone advertised 22 metres of 3 core 16 sq. mm SWA on Ebay over the weekend and it went for £21, which is less than the value of the Copper I suspect. Seller said it weighed 25 kg but that doesn't seem right.
Assuming Copper weighs 8200 kg per cubic meter,
3-core 16sq mm is 48 sq. mm * 22,000 centimetres so, 0.48 * 22,000 = 10,560 cubic cms
1 cubic cm = 8.2 grams , total mass of copper is 10,560 * 8.2 = 86592 gms = 86.593 kg
This seems too high, where have I gone wrong ?, else the value of the copper was a lot more than £21