Tim Cook schrieb:
> clipka wrote:
>> Strictly speaking, there's no such thing as a "pulling" force in air.
> 
> Sure there is.  Ever heard the phrase "nature abhors a vacuum"?  That's 
> a pulling force.  Any decrease in pressure in an atmosphere will cause 
> molecules to be drawn to the source of the pressure difference.

"Natura abhoret vacui" is a very old misconception. At 0 degrees Kelvin, 
nature has no problems with vacuum.

What is commonly percieved as a pulling force of the vaccum is in 
reality a stronger pushing force (due to collisions of molecules) from 
the high-pressure region than from the low-pressure region. As a matter 
of fact, *both* exert a pushing force.

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