There's a lot of hot water vapour.

有很多热水蒸汽。

Researchers discovered that in tropical atmospheres, cold air rises because of the lightness of water vapour.

研究人员发现在热带大中，由于水蒸很轻，所以冷空会上升。

In short, as part of the process of photosynthesis plants release water vapour from their leaves into the atmosphere.

简单来说就是光合作用的部分过程，叶片中的水蒸释放到大中。

About 3.8 billion years ago, Earth's surface had finally cooled to the point that water vapour turned to liquid.

大概在三十八亿年前，地球表面终于冷却到水蒸变成液体的程度。

A relative humidity of 100% means the air in question is holding as much water vapour as it possibly can.

100%的相对湿度意味着空中含有尽可能多的水蒸。

They were in time to produce carbon, nitrogen, water vapour and other gases, which were to make the earth's atmosphere.

最终产生了、氮、水蒸和其他多种体，从而形成了地球的大层。

The ice caps start to melt, releasing water vapour.

冰盖开始融，释放出水蒸。

Water vapour, like carbon dioxide, is a greenhouse gas.

水蒸和二氧样，是种温室体。

It's derived from water, and when you burn it, it only emits water vapour.

它来自水，当你燃烧它时， 它只会散发出水蒸。

When humid air hits a surface colder than it is, the water vapour it carries condenses onto that surface as myriad tiny droplets.

潮湿的空接触到比自身更冷的表面时，它携带的水蒸会凝结到该表面上，形成无数微小的水滴。

The water vapour spat out by the volcanoes allowed the water trapped in the Earth's bowels to make its way to the surface.

火山喷出的水蒸使得地球内部的水得以流到地表。

The idea is to test the effects on the atmospheric window of various pollutants, and also of water vapour, by releasing them into the building.

其想法是把激光束释放到建筑空间来测试不同污染和水蒸对大窗口的影响。

But as the surface eventually cooled, this water vapour condensed and settled upon the crust, pooling in lower lying areas to form  the oceans.

但随着地表最终冷却，这些水蒸凝结并沉淀在地壳上，汇集在较低的区域形成海洋。

It's made by zapping water, using electricity, and when you burn it, it just emits water vapour, which is way better than getting hydrogen from coal.

它是用电加热水制成的，当你燃烧它时， 它只会散发出水蒸，这比从煤中获取氢要好得多。

But that can't be due to human activity. The only way for the atmosphere to hold more water vapour is if it gets warmer. So... Hang on, you're not saying...

还早呢！大中的水确实也在增加。

It was one of the biggest eruptions since that of Mount Pinatubo in the Philippines in the 1990s and injected an estimated 146 million tonnes of water vapour into the stratosphere.

这是自 1990 年代菲律宾皮纳图博火山爆发以来最大的火山爆发之，估计向平流层注入了 1.46 亿吨水蒸。

During colder times, the usual process of  evaporation of the oceans goes out of balance, with the resulting precipitation of this  water vapour accumulating as snow on expanding and deepening ice caps.

在寒冷时期， 海洋蒸发的正常过程会失去平衡，导致水蒸沉淀， 并在不断扩大和加深的冰盖上积聚成雪。

Five weeks after the experiment began, all the plants were covered by bags that allowed carbon dioxide, oxygen and water vapour in and out, but stopped the passage of larger molecules, of the sort a beanstalk might use for signalling.

五周过后，实验人员给所有的蚕豆都罩上了袋子，这种袋子允许二氧、氧和水蒸出入，但那些豆茎可能用来发送信号的大分子质，却无法通过。