As long as there is a steady supply of rising air, cloud droplets are buoyed up and can't fall.

只要有持续供应的上升气流，云朵中的小水滴就会漂浮着而不会降落。

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The lower image shows the size of cloud droplets within the area outlined in white in the top image.

下图显示的是上图中白色线框区域的云滴大小。

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When water vapour condenses into cloud droplets it gives up energy and warms the surrounding air.

当水气凝结成水滴时，能量会被释放出来，使得周围的空气变暖。

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These ions are thought to help create new particles called aerosols and, when aerosols grow above a certain size, they become the seeds around which cloud droplets form.

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Using a particle accelerator, he demonstrated that cosmic rays colliding with molecules in the atmosphere can, in fact, cause gaseous water vapor to condense into cloud-forming droplets.

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These are able to measure the spectrum of the light reflected from a cloud so accurately that Dr Rosenfeld could deduce the average size of its water droplets from the amount of light that they reflected.

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