是什么让不同的大气中气体混合?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换

是什么让不同的大气中气体混合?

2016 - 02 - 01 - t00:45:08z

考虑气体离心机持有两种不同的气体。旋转一段时间后,较重的气体将搬到外面,较轻的气体会在里面。换句话说,我们有分层的气体。 为什么没有这个发生在地球大气层_2美元N和O _2美元吗? 注意:我不<强> < /强>考虑地球离心机,因为它的旋转。我把它比作一个离心机因为有重量(重力)气体。在这种情况下,氧沉淀到底,应该和上面的氮。

沃尔夫冈Bangerth回答的让不同的大气中气体混合?

2016 - 02 - 01 - t03:15:31z

也因为气体扩散。如果你单独的两种气体的不同密度水平膜,然后慢慢把膜,将分散的接口。You can try this with bromine and air, for example – the bromine will stay at the bottom (easily visible because it's brown) and the air will stay at the top, but the interface will be diffuse. The bromine will largely stay at the bottom because it's significantly heavier than the air, but the diffusive mixing will be much stronger if the density difference is smaller – as is the case with nitrogen and oxygen, which are of course not very different in density.

While the effect above just considers mixing due to molecular diffusion, the atmosphere of course also vigorously convects due to the effects of thermal heating (and humidity differences). Both also turn over the atmosphere and mix it.

That said, the composition of the atmosphere does change with altitude. See, for example, here. The thing is that the thickness of layer corresponding to the blurry interface between bromine and air is about as thick as the entire atmosphere, and therefore hard to distinguish from other effects (such as ionization) that change its composition with altitude.

戈登斯坦格的回答让不同的大气中气体混合?

2016 - 02年- 02 - t08:23:52z

扩散是重要的,但更重要的是动荡的搅拌等各种过程的对流云团,飓风,哈德利细胞,额叶系统、急流等。这是够大气的成分气体混合。