Sorry but I think they are all rpetty weak -Jagex use it correctly, there is much mis conception as to what weight is. People weigh themselves and weigh ingredients as weights. Techincally yes they are all masses and not weights, but people call them weight and measure them in kg - not everyone is good at science -In the making of such a large gold object impurtieis would be absorbed into the metal, plus you add a white gold inlay to the helm that is not a bar in your inventory both of whihc supply the extra weight -That is perfect logical, cannon balls are an iron sphere the heat caused inside the steam pwoered cannon would soften them somewhat then the friction cuase by the speed would allow the iron to react with the water. Such a combination would release some oxygen from the water and the rest would form into iron hydroxide - a gas aka it would vapourise -In real life gold and silver ore are filtered by machinery to remove more earth and impurties than some ores have but are then heated in a furnace to remove the rest hence jagexs is a perfectly logical process -Obsidian in its natural state is a weak metal yes, when interlaced with a substances like coal or occasionally granite it offers the strength and properties of the metal while gaining in durabilty and strength (thats why steel is stronger than iron) so it is correct 99% of jagexs game checks out against science fact if you devele deeper than basic fact... if im not mistaken, hammering out gold would thing the metal and also knock miniscule peices of it that would be small enough that it is not really noticable to the human eye, but would actually DROP the weight in a very small amount also...wouldnt it be iron OXIDE? meaning rust, which wouldnt form in a matter of seconds, even with this degree of pressure. and last, if im thinking correctly, obsidian is more of a crystal-type substance than a metal.
