Re: Density of gas mixture

[Doug Craigen <dcc@ESCAPE.CA>]

Robert A Cohen wrote:
> Dry air is *not* necessarily denser than moist air.  It is *if* you are
> comparing gases at the same temperature and pressure.  Most beginners
> don't not recognize this, and why do we expect them to?  Consider the
> following problem:
> ...

One of my  examples to show how people learn particular situations as
absolute rules - I ask how it is that hot air rises but the air is
colder the higher up you go in the atmosphere (where all the hot air
went)....  most people are at a loss, having never even realized a
contradiction between two of their absolute rules.


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Doug Craigen
          Latest Project - the Physics E-source
          http://www.dctech.com/physics/