The difference between a empty iPod and a full one is only a 0.4 gram say the team from Blackpool University. Tests showed that a empty 16GB iPhone weighed 133.2 grams compared to 133.6 for the same model filled with 3,500 songs.
Professor Roger Banks said: "This is the first time the weight of computer data has been measured. We all know it is made out of ones and zeros, but the ratio of ones to zeros seems to make a difference."
The boffins will now investigate whether the weight of different types of files music, video or pictures varies when they have the same file size. The discovery could mean that trading standards force makers Apple to repackage all unsold iPods and iPhones in the UK to state that weights may vary.
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