真正的云是美丽的,因为他们是巨大的,你观察他们,从而获得能够看到一个截然不同的“边界”,因此,形状。但是如果你曾经穿过云在一个平面上,从而看到一关闭,你会发现他们真的是“雾”。你会努力重建规模云在一个小环境;水分子有一个相当一致的大小和你不能只是整个系统缩减规模。同样,你可以创建一个规模的雷雨,但它可能在这么快你几乎没有看到它。一个明显的例子是水蒸气,蒸汽的运动让你的水壶和凝结。你只看到一个快速嗖的蒸汽粒子螺旋上升,这就是你会得到一样接近暴风雨。Some phenomena, such as air vortices, can manifest at smaller scales — I've seen more than a few mini-tornados forming in my garden dragging leaves around in a funnel fashion — but I'm not sure you'd ever be able to contain enough energy to see that happen for more than a fraction of a second in a small tube.