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Barometric Pressure
What is Barometric Pressure?
By
Fondriest Staff
Barometric pressure is the weight of the
overlying air pressing down on the earth.
It is also known as air pressure.
Low barometric pressure means the overlying
air is rising, whereas high pressure means the overlying air is sinking.
Why
is Barometric Pressure Important?
Barometric pressure has important effects on water chemistry and weather conditions.
It affects the amount of gas that can
dissolve in water. More gas, such as oxygen, can dissolve in water under higher
pressure when compared to lower air pressure.
For instance, more oxygen is dissolved in
water at sea level than at high altitudes.
The pressure of the overlying air forces
more gas into solution.
As the overlying pressure decreases, gas is
released from solution. A common example of this is when someone opens a
carbonated beverage.
High barometric pressure supports sunny,
clear, and favorable weather conditions, but lower levels promotes rainy and
cloudy weather conditions.
This atmospheric parameter has been used
for hundreds of years to forecast weather conditions.
Differences in barometric pressure over
large inland lakes can produce seiches, which affect water levels in the lake
and adjoining estuaries.
How
is Barometric Pressure measured?
Barometric pressure is typically reported
in inches of mercury or in millibars. 1 inch of mercury equals about 33.9
millibars,
Inches of mercury is the traditional way of
reporting air pressure. Greater air pressure pushes a column of mercury higher
in a barometer.
Millibars are a more direct measure of
barometric pressure and are the units used in SWMP.
Barometric
Pressure Technology
Traditionally, a barometer was used for
measuring barometric pressure.
SWMP uses a more modern and accurate device
called a capacitative pressure sensor.
The barometer was first devised in 1644. It
consists of a glass tube that is closed at one end and open at the other.
The tube sits vertically, with the open end
sitting in a pool of mercury.
Changes in pressure will change the level
of mercury in the tube.
Increased air pressure pushes the mercury higher into the tube, whereas decreased air pressure allows the mercury in the tube to drop.
https://www.fondriest.com/news/barometricpressure.htm
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The Basics of Air Pressure
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