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

当天文学家说到尘埃时，他们指是直径微米微颗粒。

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

PM2.5测量意思是颗粒物直径于或等于2.5微米。

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

油层厚度约为10微米，相当于头发丝直径。

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

我把它从 20 微米降低了 到0.3 微米。

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 微米或更微粒。

This is Steve Pawlowski from micron.

这是来光自史蒂夫·帕沃夫斯基。

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

我们正在看是丛中紫色素，约 50 微米。

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

作为参考，头发直径有50微米，所以只相当于头发部分。

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

哇。- 5 微米，非常完地堆叠在起。

But in reality the oil was only 10 microns thick.

但事实上油层厚度只有10微米。

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

为什么在 2.2 到 2.0 微米以下会有恒定等距力？

" 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%直径于0.3微米粒子。

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运动表面周围有约两微米凹坑。

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

根头发直径是100微米。

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

社区学院已经与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.

显微镜将摄取图像，可以看到水里5微米左右物体。

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得多，它直径只有微米部分。

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

如果你按10微米厚油层计算，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，类头发直径约是2.5微米颗粒物30倍。

The capsules were 10-15 microns across-large enough to disrupt the coatings, and thus do more harm than good.

而过去用胶囊跨度为10到15微米，这种跨度足以打乱覆盖层结构，因此对金属造成弊于利。