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The boiling point of water in Leadville, CO (elevation 10,200 ft) is about 10 C lower than in Salisbury, MD (elevation 26 ft) because atmospheric pressure is lower in Leadville.
What is atmospheric pressure?
The heavy air that surrounds you presses against everything you touch. The term "atmospheric pressure" is used to describe this pressure. When a surface is being pulled toward Earth by gravity, air above the surface exerts a force on it.
It is common practise to measure atmospheric pressure using a barometer. As a barometer, a mercury column inside a glass tube rises or falls in response to changes in the density of the atmosphere. Meteorologists can determine the air pressure by measuring the amount that the mercury climbs.
The average atmospheric pressure at sea level and 15 degrees Celsius is represented by the standard unit of measurement known as one atmosphere (atm) (59 degrees Fahrenheit). One atmosphere consists of 1,013 millibars, or 760 millimeters (29.92 inches) of mercury.
With height, atmospheric pressure drops.
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