How do you define barometric pressure?
by 
The Curious Bag
ANSWERS: 1
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Barometric pressure, or atmospheric pressure, is the amount of pressure exerted by the atmosphere on the earth. A barometer measures the pressure at any given point. Weather conditions affect barometric pressure.
Function
Barometers measure barometric, or air, pressure. Inside of a barometer is a thin tube containing mercury that expands and contracts based on the pressure.
Effects
When the pressure increases, the mercury in the barometer expands and rises. On the other hand, a decrease in air pressure causes the mercury to contract and lower.
Identification
High pressure barometric readings indicate fair weather fronts without precipitation. A low or falling barometric reading warns of precipitation and potential storms.
Types
Barometric pressure is measured in inches or hectopascals (hPa). The U.S. National Weather Service uses inches, while scientists measure pressure in hPa.
Fun Fact
Evangelista Torricelli invented the barometer in the seventeenth century.
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