"Mike Tullett" wrote in message


On 30 Sep 2003 14:31:28 -0700, Michael McNeil in
. com wrote:
snip
Besides which; the bit about condensation and evapouration is not
quite right.

I think you will find I am right in this situation, as Bernard has
indicated and explained.

Mind you, there is one place where both can occur at the same time - clouds
composed of a mixture of water droplets and ice crystals - as are many in
our latitudes. It is common for the droplets to be evaporating, at the
same time as the ice crystals are growing by deposition of water vapour
derived from the droplets. i.e. the ice crystals grow at the expense of
the water. The air is super-saturated with respect to ice but not with
respect to water.


I can't help thinking this is an oversimplification of events not unlike
the presumptions about the moon in a recent thread.

About the condensation: as long as there is room for deposition there
will be condensation. It is an ongoing process. The only difference with
the clouds and the screen top is location. If the screen was in a
balloon in a cloud.....


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