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Name: Zoe
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Question:
Hi! My class is doing stuff about... suspension! We want to know if a cloud is a suspension.


Replies:
Zoe,

Clouds are not strictly a suspension. In a suspension, particles are "suspended" within a fluid either because they have the same density as the fluid or because the fluid is viscous enough to hold them up - if the latter, in time they may drop to the bottom of the container through the force of gravity.

The water droplets in a cloud are heavier than the air that they are in. However, the air is rising, either as a layer or as a convective plume, thereby exerting a force opposite to and at least as great as gravity, to prevent them from falling.

David R. Cook


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