不用冰用液氮 战斗民族的冰桶挑战

 The ice bucket challenge may seem cool if you live in a place which is usually quite hot, but for those who dwell in a cold climate the idea is probably less impressive

冰桶挑战看起来相当酷，但前提是你处在热带地区。而对于那些生活在寒冷地区的人们来说，这个活动也许就没那么吸引人了。

Like if you lived in chilly Russia, for example, the sensation of tipping a bucket of ice water over your head is probably not dissimilar to leaving the house on a rainy day.

比如说如果你住在寒冷的俄罗斯，一桶冰水从头上浇下来的感觉也许和下大雨出门不拿伞的感觉差不多。

So it's perhaps no wonder that it's a Russian scientist who has staged the most spectacular spin yet of the ice bucket challenge – using minus 195 degree Celsius liquid nitrogen.

而一位俄国科学家不仅参与了冰桶挑战，同时用的还是装着零下195摄氏度的液氮的冰桶，这无疑是冰桶挑战的升级版。

A spectacular video shows Anton Konovalov, 34, who works at a liquid nitrogen producing chemical plant in Kryansk, Krasnoyarsk Oblast, as he grabs the bucket and pours the bitterly cold liquid over his head.

从这段精彩的视频中可以看到，在生产液氮的化工厂工作的34岁的安东·科诺瓦洛夫，抓起冰桶将其中的液氮从头浇下。

Seconds earlier he had taken a branch with some leaves from a nearby tree and plunged into the liquid nitrogen, freezing it instantly so it could be crumbled into shards in his hands.

在浇之前，安东曾把一根小树枝伸进冰桶里，树枝立刻被冰封，并很轻易地在他手中被碾成了碎片。

Yet when he pours the liquid nitrogen over his head, instead of freezing himself solid, he simply shakes his head and indicates yes, it is cold, but I'm still here.

当安东把液氮迎头浇下后，并没有像树枝一样被冻住，他只是摇摇头，表示“虽然很冷，但我一切OK”。

Mr Konovalov said before the challenge: 'I am putting my faith in the laws of physics, biology and mathematics and I hope nothing will go wrong.

'挑战之前安东曾说：“我怀着对物理、生物及数学原理的信任进行这场挑战，希望一切顺利”

Just to make sure he is not frozen solid after taking the liquid bath, his friend pokes him to check he is still soft as the intrepid scientist laughs into the camera.

为确认安东确实安然无恙，液氮浇下之后，他的朋友们还上前触碰他，可以看到他的皮肤依然是柔软的。而这位勇敢的科学家面对镜头时还在哈哈大笑。

It's possible for liquid nitrogen to pass on top of human flesh without freezing, because when it is poured onto the human body, something called the Leidenfrost effect comes into play.

其实液氮流经皮肤而不对人体造成伤害是有可能的，因为此时一种被称为“莱顿弗罗斯特效应”的现象会发生作用。

This is a phenomenon in which a liquid produces a layer of insulating vapour that prevents the liquid coming into direct contact with a surface significantly hotter than the liquid's boiling point.

这种现象是指，当物体表面的温度远高于液体的沸点时，液体会形成蒸汽隔离层，因此不会和该物体表面发生直接接触。

That is to say, because liquid nitrogen has such a low temperature, when it comes in contact with human skin, the temperature difference causes the Leidenfrost effect and it simply skims off the surface of the body.

也就是说由于液氮温度太低，人的体温相对来说极其炙热，因此当液氮流经人体时会仅仅从皮肤表面掠过，这就是“莱顿弗罗斯特效应”。