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Re: air blowing out of an old mine





David Bone <dbone@scnc.bas.k12.mi.us> writes:
. Maybe the hot air from the bottom cools as it rises and expands but
that doesn't explain why it would blow straight up into the 90 degree
air
of a hot summer day.

Perhaps the rising air in the mine can be compared with
rising water and steam from a geyser. As the water is heated
by the high temperatures (far above water's boiling point)
below the surface it drives out the cool water near the surface
with an almost explosive force. The temperature of the
air above the surface is irrelevant.

Herb Gottlieb from New York City
(Where geysers errupt when water mains rupture)