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barometric pressure
Meteorology.
A hurricane is an area of low barometric pressure. This tends to pull air inward.
In weather: Before a storm comes to an area, say Kansas, the barometric pressure would drop, indicating an imminent storm
High pressure situations are generally associated with fair, sunny weather. As high pressure is an area of sinking air, and air tends to dry out as it sinks, leaving sunny skies.
Atmospheric pressure is defined as the force per unit of area pressed against a surface by the weight of the air. The simplest way to observe barometric pressure is by looking at a barometer. The simplest barometers involve the atmospheric pressure pushing a liquid up a tube by pushing down on surrounding liquid.
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barometric pressure
Air pressure, barometric pressure, the boiling point of water.
Meteorology.
METEOROLOGY
The "depression" refers to the fact that it's an area of low barometric pressure.
A hurricane is an area of low barometric pressure. This tends to pull air inward.
As of today, July 13, 2013, the current barometric pressure for Orlando, Kentucky is 29.83 inches. This is an important factor in determining the weather conditions in the area.
A barometer.Barometric pressure is usually read and rated in millibars of atmospheric pressure. A standard day at sea level, would be 29.9 on the barometric scale. That is, neither a high or low pressure in the area and generally sunny.
It depends on what you mean by change. If your mean "Does the pressure swing from lows like 28 inches mercury (severe low) to 32 inches mercury (severe high)?" then the answer would be yes. This sort of shift is what causes most severe weather disturbances, such as lines of thunderheads. The collision of a high pressure and low pressure area cause strong winds, usually some precipitation, and even tornados and other severe weather. If, however, you mean "Is the barometric pressure constant most of the time?" then the answer would be no. The barometric pressure has constant small fluctuations, based on a number of factors.
In weather: Before a storm comes to an area, say Kansas, the barometric pressure would drop, indicating an imminent storm