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Pressure and Winds

Surface Patterns of Pressure and Winds

TermDefinition
Atmospheric Pressure is: The gravitational pull of gasses to the surface, creating air pressure. Meaning force exerted by air molecules.
Barometers (2) is: A tool used to measure air pressure. Type 1: Mercury Barometer uses liquid (Mercury) to measure air pressure. Type 2: Aneroid Barometer uses non-liquids to measure air pressure.
Milibars is: The units of air pressure in mb.
Advection is: The horizontal transportation of atmospheric properties such as heat, moisture, or pollutants through the winds.
Surface Low pressure system is: Less dense, rising air, that causes unstable weather and poor air. It flows in and upward.
Surface High pressure system is: More dense, sinking air, that gives fair weather and clear skies. It flows out and downward.
Pressure Gradient Force is: The movement of air that forces (crowded air molecules) high pressure to (spacious area) low pressure zones to balance the atmosphere.
Coriolis Force is: The effect caused by Earth's rotation that forces moving objects to curve rather than move in a straight line.
Geostrophic winds are: High altitude winds that flow in a straight path parallel to isobars, and are formed from a perfect balance between the Pressure Gradient Force (pushing air) and Coriolis Force (deflecting air because of Earth's rotation.
Friction is: The mechanical and resistive force exerted by Earth's surface that slows down wind speed.
Convergence causes: Air to rise, leading to clouds, precipitation, and low-pressure systems.
Divergence causes: Air to sink (subsidence), resulting in clearing, warming, and high-pressure systems.
Troughs are: A southward jet stream that dips, representing unstable weather, cloudiness, cold and low-pressure systems.
Ridges are: A northward jet stream that bulges, representing stable weather, clearing, warm, and high-pressure systems.
Isobars are: Drawn lines on a weather map connecting points of equal atmospheric pressure.
Created by: Elavinahla8
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