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

当天文学家说到尘埃时，他们指是一微米微小颗粒。

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

PM2.5测量意思是颗粒物小于或等于2.5微米。

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

油层厚度大约为10微米，相当于头发丝。

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

结果是，这样线仅有20微米而非50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”，即为 2.5 微米或更小微粒。

This is Steve Pawlowski from micron.

这是来美史蒂夫·帕沃夫斯基。

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

我们正在看是一丛中国紫色素，大小约 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，头发有50微米，所以只相当于头发一小部分。

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

哇。- 5 微米，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%小于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大约两微米凹坑。

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

一根头发是100微米。

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

社区学院已经与美公司等公司建立了合作伙伴关系，专注于动化技术。

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小得多，它只有一微米一小部分。

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，人类头发大约是2.5微米颗粒物30倍。