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下的书越多,电子书越重

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小编摘要:电子书的重量会随着下载图书的数目而变化,这可能与许多用户的预期不太一样吧?但不必担心,重量并不会增加很多,只是对耗电有一定影响。

 导读:大家也许都认为电子书相对于纸质书的最大的优势就是没有重量,这么想可以理解。然而这个想法并不完全正确。一位计算机科学家的研究表明,一本装满书的Kindle要比没装书的要重一些。然而即便是学习欲最浓的读者也不会因此觉得有负担,因为重量的差别小于一个单独的DNA分子,当然可以忽略不计啦!

You'd be forgiven for imagining that one of the benefits of e-books is that, unlike heavy hardbacks, a digital best-seller is entirely weightless.

However, this is not quite correct, according to a computer scientist - a Kindle full of downloads weighs more than an empty one.

But even the keenest readers are unlikely to suffer too much of a burden, as a full library of e-books weighs no more than a single molecule of DNA

According to John Kubiatowicz, from the University of California, Berkeley, the difference between an empty e-reader and a full one is just one attogram, or 10-18 of a gram.

This weight is so tiny as to be 'effectively unmeasurable' by any scales that currently exist, he says.

The difference in weight is far less than the difference produced by charging the battery, or wiping dust off the screen.

And electronic devices tend to grow heavier in sunlight and in warm weather, a change which massively outstrips the effect of downloading more data.

By comparison, 3,500 paperbacks - equivalent to the capacity of the Kindle - would weight around two tonnes.

Prof Kubiatowicz's findings are based on the fact that, while downloading an e-book does not change the number of electrons in an e-reader, those electrons holding data have a higher level of energy.

The relationship between energy and mass - famously summarised by Einstein as E=mc2 - means that those with a higher energy also have a higher mass.

The total extra mass of a full Kindle, Prof Kubiatowicz wrote in the New York Times, is an attogram - or 0.000000000000000001g.

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2011-10-31 17:16 编辑:lilylikelily
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