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如果实验时不戴护目镜会怎样? – 译学馆
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如果实验时不戴护目镜会怎样?

Why you need to wear safety glasses - Periodic Table of Videos

我们有个极好的例子来证明
We have an amazing demonstration of
为什么在实验室戴护目镜很重要
why safety glasses are important in the lab.
是一个很简单的实验
It’s a very simple demonstration.
把一管密封的水放在几个西红柿前加热
Sealed tube of water heated up in front of some tomatoes.
其中两个西红柿带护目镜 另外两个不带
Two of the tomatoes are wearing safety glasses, two of them are not.
我们用西红柿做实验 因为它们有点类似眼球
We used tomatoes because tomatoes are a bit like eyeballs
而且 我们觉着要是真从肉店要来眼球
and we thought it would be much too
就有点吓人了
gruesome to get real eyeballs from the butcher.
当我们加热其中一管水的时候……
When we heat one of these sealed tubes…
喀拉喀托火山于19世纪后期发生了灾难性地爆发
They’re called Krakatoa tubes after the volcano that exploded catastrophically
此后 这些管子就被称作“喀拉喀托管”
in the late 19th century.
开始加热后 管子里的水开始沸腾
As you heat it, the water begins to boil.
水变成水蒸汽
Water turns into steam.
水蒸气的体积比液态水大得多
The volume of steam is much bigger than the volume of water.
所以管内压力不断变大变大再变大
So the pressure goes up and up and up
如果管子足够结实
and can reach several hundred atmospheres
管内气压可以达几百个大气压
if the glass is really strong
突然
Then suddenly
[玻璃管碎裂]
[Glass tube bursts]
玻璃碎片到处飞
and pieces of glass fly everywhere
[玻璃管碎裂声]
[Glass tube bursts]
[玻璃管碎裂声]
[Glass tube bursts]
[玻璃管碎裂声]
[Glass tube bursts]
现在来看看可怜的西红柿
And if you look at the poor tomatoes.
你可以看到
You can see that the tomatoes
没带护目镜的西红柿已经被玻璃碎片刺穿了
without the safety glasses were pierced by pieces of glass.
其中一个已经被剥皮了
One of them was actually peeled.
这可真是重新定义了“刮目以视”啊
Gives a new meaning to having your eyes peeled.
可以看见有一片玻璃已经穿透了眼球
You could see where the glass had gone through the eyeball.
但正如所有实验一样
But like all demonstrations that we do,
我们会多做几遍
we thought we would do it several times.
第二轮实验中
In the second run,
玻璃管不是很坚固 碎的声音很小
the glass tube wasn’t strong enough and it went off with a really quite small bang.
[玻璃管碎裂声]
[Glass tube bursts]
事实上 在高速摄像头下
In fact, in high speed,
可以看到管子像火箭一样飞行
you can see the tube flying away like a rocket.
第三次管子爆炸得很响 真的!
The third tube, was an enormous explosion. Really!
连我们勇敢的技术员内尔都吓得一摇晃
Even Neil, our gallant technician, with a bit shaken.
[玻璃管碎裂声]
[Glass tube bursts]
在实验中
In this case,
带护目镜的眼球轻微受损 因为爆炸把护目镜炸飞了
the eyeballs with the safety glasses were slightly damaged because the explosion blew the glasses up
[玻璃管碎裂声]
[Glass tube bursts]
当然 我们的模拟实验条件中 没有加上鼻子
And of course, in our simulation there isn’t a nose. So,
因此 有些玻璃碎片
some of the glass got
从原本鼻子的空隙钻了进去
through the gap where you would normally have your nose.
护目镜的保护效果……
The protecting effect of the glasses…
[玻璃碎裂声]
[Glass tube bursts]
虽然我们称之为“玻璃”护目镜
We call them glasses
但实际上它是由聚碳酸酯塑料做成的
they’re actually made out of plastic poly-carbonate.
如果你靠近点看
If you look close up,
你能看到镜面塑料被飞溅的玻璃砸出了一个个小坑
you can see where the plastic has been pitted by the flying bits of glass.
这个护目镜可能没法再用了 因为上面有了划痕
The safety glasses are probably not usable again afterwards because of the scratches. But,
你可以把护目镜扔了
you can throw those away.
但你可不能多次扔掉自己的眼球
You can’t throw away your eyeballs more than once.

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视频概述

本视频用西红柿模拟眼球,告诉我们做实验时戴护目镜的重要性

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翻译译者

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视频来源

https://www.youtube.com/watch?v=E6B3uvhrcQk

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