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『新知』存书越多 电子阅读器越重  

2011-11-04 05:29:54|  分类: 默认分类 |  标签: |举报 |字号 订阅

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E-readers get heavier with each book
存书越多 电子阅读器越重

E-readers are meant to let bookworms carry their entire libraries with them without any additional weight – but the devices actually get heavier every time a new text is downloaded.
电子阅读器意味着书虫们可以轻松地随身携带他们整个图书馆而不用担心重量,但事实上每新存进一本书这些设备也会变重一点哦。

The weight difference is unlikely to make much difference to holidaymakers' baggage allowances, however, because each new tome is about as heavy as a single molecule of DNA.
然而这种重量的变化并不会对出行者的行李造成什么影响,因为每本书的影响不过是一个DNA单分子的重量而已。

Filling a 4GB Kindle to its storage limit would increase its weight by a billionth of a billionth of a gram

Prof John Kubiatowicz a computer scientist at the University of California, Berkeley, explained in theNew York Times last week that storing new data involves holding electrons in a fixed place in the device's memory.
加州大学伯克利分校的计算机科学家John Kubiatowicz博士在上周接受纽约时报采访时解释说,新存入一些数据会在这些设备的内存中某个固定的地方聚集一些电子。

Although the electrons were already present, keeping them still rather than allowing them to float around takes up extra energy – about a billionth of a microjoule per bit of data.
虽然这些电子是本来就已经存在的,但把他们从自由运动的状态改变成固定一地会消耗一些额外的能量,大约十亿微焦耳每比特。

Using Einstein's E=mc? formula, which states that energy and mass are directly related, Prof Kubiatowicz calculated that filling a 4GB Kindle to its storage limit would increase its weight by a billionth of a billionth of a gram, or 0.000000000000000001g.
根据爱因斯坦E=mc? 的公式,我们知道能量跟质量有着直接的关系。Kubiatowicz教授计算出一个装满了4GB内容的Kindle会比空机增重0.000000000000000001g。

This is roughly equivalent to the weight of a small virus, while the equivalent number of books – about 3,500 – would weigh approximately two tons.
这基本相当于一个小病毒的重量,而同等数量的书籍(大约3500本)则将重达2吨左右。

E-readers could also become slightly heavier in the summer, because they would take on more energy from their exposure to sunlight, scientists explained.
科学家们也认为,电子阅读器在夏天会更重些,因为当其暴露在日光下时它们就会消耗更多能量。

Graeme Ackland, of Edinburgh University, told the Guardian: "If Prof Kubiatowicz is really struggling with the extra weight, he is welcome to come to Edinburgh where it's cooler, and the lack of thermal energy in his Kindle will more than compensate."
爱丁堡大学的Graeme Ackland告诉卫报:“如果Kubiatowicz教授真的很在意多加的重量的话,我欢迎他来爱丁堡。我们这里冷多了,他的Kindle能省出更多热能。”

原文链接:每日电讯报

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