数据有重量:存多少内容后手机会感觉变重?

我们知道照片,视频,音乐和其他数码文件都是1和0组成的——但是这些数据有没有重量呢?需要多少G的数据才会让我们的iPhone重一点呢?Joe Carmichael就探索了这一问题,下面就是他的发现。
智能手机里的闪存跟笔记本和台式机的机械硬盘是不一样的。实际上,固态硬盘要快得多也高级得多。随着成本的降低,越来越多的电脑也装上了固态硬盘。
加州大学伯克利分校的计算机科学家John D. Kubiatowicz解释说,一个字节的数据确实会有重量,虽然极其微小——大约是1阿克,也就是1克的1/10^30。
那是因为闪存是通过俘获电子区分1和0,虽然电子的数量不会改变,但是一旦它们被俘获(或者数据被储存),它们就有了更高的能量等级,因此重量也更大。
回到我们的问题,储存多少数据才会让我们能真正感觉到iPhone重了一点呢?而不只是微观上的变化。
根据韦伯定律(表明心理量和物理量之间关系的定律),人类可以感知的两个物体间的重量差距是5%以上。iPhone 6s的重量是143克,也就是说需要有7克的差距我们才能感觉到。
现在整个互联网有大约5万亿T的数据,这个重量大约是1盎司的百万分之0.2,或者是1克的二十万分之一多一点(一粒细盐的样子)。
很显然,这比7克要少得多,所以你要把整个互联网的数据量再乘以一百万倍才有iPhone 6s的5%。
这个算得很粗略,但至少给我们一个大概的数字:要得到7克的重量,大约需要5.7*1000^6T的数据。
如果你对这个没啥概念,这大概是人类记忆力(大约是1.25T)的4*1000^5倍,或者足以装满40*1000^5部128G的iPhone 6s。
换句话说,尽管装照片和视频吧,因为虽然每字节都增加着重量,但是距离你能感觉到还远得很。

03FC

http://www.sciencealert.com/how-much-data-does-it-take-to-make-your-iphone-heavier

How much data does it take to make your iPhone heavier?

Spoiler: a lot.

We know that the 1s and 0s that make up our photos, videos, music, and other digital files are actually physically present on a memory drive - but does this written data actually weigh anything? And how many gigabytes' worth would it take before we noticed the difference on a flagship iPhone? Inverse's Joe Carmichael took a long, hard look at the science behind that question, and here's what he found.

The flash memory inside modern-day mobile devices is different from the older mechanical hard drives found in a lot of laptops and desktops. In fact, the newer solid-state drives are so much faster and superior, they're starting to make their way to full-sized computers as the price of this type of storage continues to drop.

As computer scientist John D. Kubiatowicz from UC Berkeley explains in The New York Times, a stored data byte does actually have a physical weight, albeit a very, very small one - around 1 attogram, which is one-quintillionth of a gram.

That's because flash memory uses trapped electrons to distinguish between 1s and 0s - while the number of electrons doesn't change, once they're trapped (or once data is stored) they have a higher energy level and thus a greater weight.

Which brings us back to how much data we'd need before an iPhone would be noticeably heavier in the hand, not just to a super-precise set of scales.

According to Weber's Law, humans can tell if two objects weigh different amounts if the discrepancy is more than 5 percent. With the most recent iPhone 6s weighing in at 143 grams, that means we need something in the region of 7 grams of data for it to be noticeable.

Now, the entire Internet - some 5 trillion terabytes, give or take a blog post or two - is estimated to weigh about 0.2 millionths of an ounce or a little more than 1/200,000 of a gram (bear with us here).

Obviously that's a lot less than the 7 grams we're aiming for, and so you'd need to multiply the entire weight of the Internet more than a million times to reach 5 percent of an iPhone 6s.

All this maths is very rough and speculative, but it at least gives us a general idea of what we're dealing with. When all the calculations are worked out, the final figure is 5.7 quintillion terabytes of data would equal 7 grams.

If that doesn't mean much to you, it's about four quadrillion times the estimated size of the human memory (1.25 terabytes), or enough data to fill roughly 40 quadrillion large (128 GB) iPhone 6s handsets.

In other words, put as many photos and movies on your phone as you like, because you're an unimaginably long way from making any perceptible difference to its weight - even though each extra byte adds a little more.


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