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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

What is standard atmospheric pressure at sea level? How do you suppose Earth’s gravity is related to atmospheric pressure?

To determine

The standard atmospheric pressure at sea level and the way in which the Earth’s gravity is related to atmospheric pressure.

Explanation

The basic instrument that measures the atmospheric pressure is mercury barometer and the instrument is invented by Evangelista Torricelli, a student of Galileo in 1643. A mercury barometer is not actually measuring the pressure applied by the atmosphere but it measures with response to atmospheric pressure.

Meteorologist typically works with actual pressure units, sometimes millibar (mb). Standard sea-level pressure is equal 1013.2 millibars and it causes 76 centimeter rise of mercury in barometer.

Air pressure declines with increasing height on the Earth and with altitudes above it because in higher altitude, the air molecules become more widely spaced and diffused...

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