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iirc:
from the heating, capping, and cooling, you do create lower air pressure. in addition, as long as your flask doesn't have any serious flaws, it can easily withstand a vacuum.
now - you could create a very close approximation to a vacuum by using a vacuum pump to remove nearly all of the air.
since temperature is really the measure of the state of excitement of atoms, since there aren't any atoms to measure i think the temperature would be considered absolute zero. however, it has been awhile since i took chemistry, so i may be wrong....
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