Final answer:
The atmospheric pressure in inches of mercury decreases by about 1 inch per 1000 feet increase in elevation.
Step-by-step explanation:
The atmospheric pressure in inches of mercury decreases by about 1 inch per 1000 feet increase in elevation.
For example, if the atmospheric pressure at sea level is 30 inches of mercury, then at an elevation of 1000 feet, the atmospheric pressure would be around 29 inches of mercury.
This relationship between atmospheric pressure and elevation can be observed in the decrease in mercury column height in a barometer as altitude increases.