Quote:
What is barometric pressure?
A: Barometric pressure is the pressure of the air that's pressing in all directions. In regular weather forecasts, the meteorologists are almost always talking about the air's pressure at the ground. The air's pressure is caused by the weight of all the air above the ground pressing down - gravity pulls air toward the earth just as it pulls everything else. It's called "barometric" pressure because an instrument called a barometer is used to measure air pressure.
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Q: What does a barometer measure?
A: barometer measures the pressure of the air pushing on it. On the average, at sea level, the air has a pressure of 14.7 pounds per square inch. This means a square one inch on each side has 14.7 pounds of air pressure on it. We don't feel it because the pressure is pushing with equal force in all directions. Instead of using pounds per square inch, barometers in the U.S. measure the pressure in inches of mercury. This is how high the pressure would push mercury into a tube that has the top sealed off from the air. A reading of 29.92 inches of mercury is the same as 14.7 pounds per square inch.
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