Good question, the answer is rather complicated.
I hope I have understood what you are
First Mean Sea Level (MSL) is
usually defined as the average height of the ocean
at a particular location, averaged over a 19 year
period. This occurs at an elevation of zero. As
you probably know, as a general trend, increasing
elevation corresponds to decreasing
Is your question possibly this:
How low of a pressure can a vacuum pump generate
at different elevations?
This is an
interesting question. Lets think about the
extremes. Say we have a mediocre vacuum pump that
here in Santa Barbara can produces a vacuum in a
small container of 10 Torr (0.014 times our
ambient atmosphere, which is 735 Torr). The SAME
PUMP, at a higher elevation of Mt. Everest where
the pressure is only ~230 Torr does not have to
work as hard to produce a vacuum of 10 Torr in the
same small container. Therefore, it might,
depending on the pump, produce a different (lower)
vacuum such as 5 Torr.
So, in general, a
vacuum pump is working to push gas (usually air)
from one reservoir (a small closed container) to
another (the atmosphere). This creates a pressure
gradient that favors the gas moving back from our
atmosphere into the vacuum container. The pump
must work AGAINST this pressure gradient. At
higher elevations, this gradient will be smaller,
given the vacuum pressure (in the small
containers) are the same. Therefore, it is likely
that identical pumps could produce a lower vacuum
at higher elevations. Think about even higher
than Everest, SPACE! Here there already is a
vacuum, so a pump doesn't have to work at all.
But, it also doesnt have any gas to push around
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