AQA · Physics · 8463
GCSE Physics: Atmospheric pressure
Forces · AQA GCSE Physics (8463), specification point 4.5.5.2. Cards are generated from the exam board's own specification for "Atmospheric pressure", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What is the Earth's atmosphere?
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A thin layer of air around the Earth (thin relative to the size of the Earth).
The atmosphere gets ? dense with increasing altitude.
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less
What creates atmospheric pressure?
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Air molecules colliding with a surface.
How does atmospheric pressure change as height above ground increases?
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It decreases.
Why does atmospheric pressure decrease with increasing height?
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There are fewer air molecules (so less weight of air) above a surface at greater height, so fewer collisions and less pressure.
The number of air molecules above a surface ? as the height of the surface above ground level increases.
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decreases
What determines the weight of air above a surface?
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The number of air molecules above that surface.
Where is the atmosphere most dense: at sea level or at high altitude?
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At sea level — density decreases with increasing altitude.
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