Clouds and Suspensions
Hi! My class is doing stuff about...
suspension! We want to know if a cloud is a suspension.
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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Update: June 2012