:I believe that it has something to do with the metals used are slightly radioactive and are emitting either alpha or beta particles causing a very slight decrease in weight. The answer doesn't have anything to do with relativity and is a well know issue. Scientists are currently trying to come up with a better way of standardizing mass. [[User:CaseyF|CaseyF]] 19:56, 27 August 2011 (EDT) | :I believe that it has something to do with the metals used are slightly radioactive and are emitting either alpha or beta particles causing a very slight decrease in weight. The answer doesn't have anything to do with relativity and is a well know issue. Scientists are currently trying to come up with a better way of standardizing mass. [[User:CaseyF|CaseyF]] 19:56, 27 August 2011 (EDT) |