When astronomers talk about dust, they mean tiny grains a micron across.

当天文学家说到尘埃时，他们指的是直径一米的小颗粒。

The PM2.5 measurement means the particles are 2.5 microns or less in diameter.

PM2.5的测量的意思是颗粒物的直径小于或等于2.5米。

Their oil layer was about 10 microns, or about a hair's width thick.

油层厚度大约为10米，相当于头发丝的直径。

And I got it down from 20 microns down to 0.3 microns.

我把它从 20 米降低了 到0.3 米。

The result is a wire a mere 20 microns across, instead of 50 microns.

结果是，这样的线有20米而非50米。

The shorthand for that is PM2.5, which are fine particles that are 2.5 microns or smaller across.

其简称为“ PM2.5”，即直径为 2.5 米或更小的粒。

This is Steve Pawlowski from micron.

这是来美光的自史蒂夫·帕沃夫斯基。

We're looking at one clump of the Chinese purple pigment and the size is around 50 micron.

我们正在看的是一丛中紫色素，大小约 50 米。

As reference, your hair is 50 microns so this is point 3, it's a fraction of your hair.

作为参考，头发的直径有50米，所以只相当于头发的一小部分。

Wow. - Point five microns are stacked together very perfectly.

哇。- 5 米，非常完美地堆叠在一起。

But in reality the oil was only 10 microns thick.

但事实上油层厚度只有10米。

Why is there a constant isometric force below 2.2 to 2.0 microns?

为什么在 2.2 到 2.0 米以下会有恒定的等距力？

" N95" means they block at least 95% of particles smaller than 0.3 microns across.

N95意味着它们至少能阻挡95%直径小于0.3米的粒子。

They noticed many of their pieces of debris sported surface pits around two microns across.

他们发现很多塑料碎片的运动表面周围有大约两米的凹坑。

And to put this into perspective: a human hair is 100 microns across.

一根头发的直径是100米。

The community college has built a partnership with micron corporation among others focusing on automation technology.

社区学院已经与美光公司等公司建立了合作伙伴关系，专注于自动化技术。

And that microscope will take images of what's in the water down to about five microns.

显镜将摄取图像，可以看到水里5米左右的物体。

But a transistor, in comparison, is much smaller, at a tiny fraction of a micron across.

但是晶体管相比之下要小得多，它的直径只有一米的一小部分。

If you do the calculation for oil 10 microns thick the drop should move way slower.

如果你按10米厚油层计算，那么水滴移动速度应该慢很多。

The diameter of human hair, for example, is about 30 times larger than a particle of 2.5 microns.

例如，类头发的直径大约是2.5米颗粒物的30倍。