On Oct 23, 3:07 pm, "Joe AutoDrill" wrote:
Ditto in score (480) and ditto in complaints.
Without the piston creating a (partial) vacuum, the atmosphere could
NOT push in the air....and the piston down.

Without an atmosphere, there would be no vacuum.
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Vacuum is the default. The voids of space are a vacuum.
Atmosphere and its pressure are the aberration.

The piston is mechanically pulled down to create a condition akin to a
vacuum.
The mere presence of an atmosphere allows a flow to occur TO the
vacuum.
The atmospheric pressure does NOT create a vacuum. In the piston's
case, a mechanical event creates a vacuum. The void created by
removing atmospheric pressure creates the vacuum, therefore......