All of you are definitely WRONG Wrong wrong... We should have scientific evidence to make a conclusion! 樓主should not be confused by all the responder above!
From computer science view, WHITE-BLACK =FFFFFF-000000 =FFFFFF >0
From mathematical science view, WHITE-BLACK =(23 x 26^4 + 8 x 26^3 + 9 x 26^2 + 20 x 26^1 + 5 x 26^0) - (2 x 26^4 + 12 x 26^3 + 1 x 26^2 + 3 x 26^1 + 11 x 26^0) =9532036 >0
From medical science (X-ray) view, BLACK is air/gas, while WHITE is anything denser than air/gas. Hence WHITE is heavier than BLACK.
All scientific evidence clearly points out that WHITE iphone should be heavier la!