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羊毛衣会缩水,为什么绵羊不会? – 译学馆
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羊毛衣会缩水,为什么绵羊不会?

Why Don’t Sheep Shrink In The Rain?

如果你洗一件羊毛衫 它会缩水
If you put a wool sweater through the laundry, it shrinks.
那为什么绵羊不会?你知道羊毛出自羊身上 为什么它们在雨天
So why don’t sheep, which are, you know, basically made of wool, why don’t they shrink
不会缩水?
in the rain?
答案可归根于摩擦力
The answer comes down to friction.
像所有的哺乳动物的毛发一样 羊毛纤维被大量的一个压一个的鳞状物覆盖着 它们从末梢到顶端
Like all mammal hair, wool fibers are covered in overlapping scales that run the length
覆盖在每一根纤维上
of each fiber.
这些重叠部分使得纤维比其他更容易向一个方向滑动
These scales make it easier for the fiber to slide in one direction than the other,
这是为什么你拽一根头发并用手指拉拽
which is why, if you grab a strand of your hair and pull it through your fingers, you’ll
你就会发现它向发尖移动比向发根移动更平滑
find it moves more smoothly going toward the tip than toward the root end.
当羊毛 人的头发和毛衣扔被扔进洗衣机
When a wool – or human hair – sweater gets thrown into the washing machine and tossed
甩来甩去 单向阻力成了一个问题 因为当每根纤维
around, this one-way resistance becomes a problem, because, as each fiber rubs against
与它的“邻居”们相互摩擦时 它的鳞状物就像小棘轮的作用一样 仅允许纤维
its neighbors, its scales act like little ratchets, only allowing it/the fiber to move
向一个方向移动
in one direction.
水使得情况更糟 它导致了纤维膨胀 这使得纤维联接
The water makes things worse, both by causing the fibers to swell, which brings them into
更紧密 使鳞状物变软 松软得足够让它们被
closer contact, and by softening the scales, which makes them floppy enough to get caught
临近的纤维轻易地逮住 但没有松软到让他们可以给
on neighboring fibers more easily, but not so floppy that they can give way and allow
这些纤维让路去彼此互相通过
the fibers to move past each other.
热度也会加剧刺轮反应 可能是通过使毛发更柔韧
Heat also exacerbates the ratchet effect, probably by making the hairs more bendy, which
使纤维连接更紧密 就像做熟的意大利面条 比还没有煮的硬硬的面条
brings them into greater contact, the same way cooked spaghetti noodles touch in more
碰触到的地方要多
places than hard, uncooked ones.
在整个洗涤和烘干循环过程中 羊毛衫上成千上万的个体纤维上的
Throughout the course of the wash and dry cycle, the millions of tiny ratchets on the
数百万个微小的小棘轮使纤维变得越来越紧密
thousands of individual fibers in the wool sweater draw the fabric into a tighter and
从而使毛衣的尺寸整体缩小
and tighter configuration, shrinking the overall size of the sweater.
当绵羊淋雨时 他们厚厚的毛皮上的纤维膨胀 而且纤维表面的鳞状物
When sheep get caught in the rain, the fibers in their thick coats swell and their scales
也变的松软了 但他们的羊毛不会被帅来甩去 也就无法形成刺轮效应
soften too, but their wool doesn’t get tossed around enough for the ratchet effect to cause
从而使它变紧 除非这些绵羊真的是疯了 到处乱撞
it to tighten…unless those sheep get really RAMbunctious.
谢谢观看
Thanks for watching!
本期视频内容是由于一位观众的建议–—谢谢 丽贝卡
The idea for this video actually came from a viewer – thanks Rebecca!
我们很高兴收到你们的投稿对我们最大的鼓励是加入
We love hearing from you, and one of the best ways to weigh in on what we do is to join
MinuteEarth Patron 社区 让我们知道你感兴趣的内容
the MinuteEarth Patreon community, where you can let us know what you’re curious about,
并确保我们能够继续制作视频
and ensure that we’re able to keep making videos.
别羞怯快来加入我们吧
Don’t be sheepish: come join us at Patreon.com/MinuteEarth.

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你知道为什么我们的羊毛衣物会缩水吗?快来一探究竟吧!

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视频来源

https://www.youtube.com/watch?v=-_Pb0Abb6hc

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