The pressure exerted by the weight of air in the atmosphere at the surface of the Earth.
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What unit is used for pressure?
Millibar (mb).
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What is used to measure atmospheric pressure?
Barometer.
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What is the average atmospheric pressure at sea level?
1013mb.
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How does pressure change with altitude?
Pressure decreases.
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How is pressure affected by a rise in temperature?
The air expands and rises by convection so pressure decreases.
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How is pressure affected by a fall in temperature?
The air contracts and becomes denser so pressure increases.
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What weather is high pressure associated with?
Dry weather. Air warms as it descends leading to the evaporation of most water vapour.
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What weather is low pressure associated with?
Precipitation and windy conditions. As the air ascends it cools and cannot hold much water vapour, water condenses which becomes clouds at condensation level.
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Other cards in this set
Card 2
Front
What unit is used for pressure?
Back
Millibar (mb).
Card 3
Front
What is used to measure atmospheric pressure?
Back
Card 4
Front
What is the average atmospheric pressure at sea level?
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