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2) Why is hot air less dense than cool air?
In aOK.
balloon the hotter air would collide with the balloon surface with
more kinetic energy and therefore stretch the balloon to a larger
size.
Larger size and same # of particles = less density. Less density =
greater buoyant lifting force than gravitational force.
However when hot air is unconfined in the atmosphere what acts as the
surface of the balloon?
1) Why should humid air in a building tend to rise to the ceiling?
The thought that comes to my mind is that the source of humidity is
generally people breathing hot air. Hot air rises and therefor the
humidity goes along for the ride.
However, I am not satisfied with this answer
3) If the air I am breathing right now was trapped into a well
insulated tightly sealed container and was allowed to sit on a shelf
for a period of time would that various molecules settle into layers.
Heavy molecules on the bottom and light on the top?