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What affects the barometric air pressure? Does the time of day or the temperature have an affect on the air pressure?
Question Date: 2005-02-23
Answer 1:

The barometric pressure at a particular elevation is determined by the standard barometric pressure at sea level, the particular elevation (if you are above sea level) and the average mass of air at that elevation, as well as the temperature.

So the barometric pressure does depend on temperature. Since the temperature changes with the time of day, that in turn means that the barometric pressure also changes with the time of day.

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