Difference between revisions of "Atmospheric Pressure"
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: [[Fluid Pressure|Pressure]] in a [[fluid]] is due to the [[weight]] of the [[fluid]] above the [[object]]. As an [[object]] gets higher, there is less [[atmosphere]] above that [[object]]. | : [[Fluid Pressure|Pressure]] in a [[fluid]] is due to the [[weight]] of the [[fluid]] above the [[object]]. As an [[object]] gets higher, there is less [[atmosphere]] above that [[object]]. | ||
: The reduction in [[pressure]] is related to the [[density]] and motion of [[particle]]s in the [[atmosphere]]. | : The reduction in [[pressure]] is related to the [[density]] and motion of [[particle]]s in the [[atmosphere]]. | ||
| − | At higher | + | At higher altitudes: |
*The [[atmosphere]] is less [[density|dense]] - Less frequent [[collision]]s between the [[particle]]s and the surface of the [[object]]. | *The [[atmosphere]] is less [[density|dense]] - Less frequent [[collision]]s between the [[particle]]s and the surface of the [[object]]. | ||
*The [[temperature]] is colder - [[Particle]]s move more slowly leading to less [[collision]]s and the [[collision]]s which do happen occur with less [[force]]. | *The [[temperature]] is colder - [[Particle]]s move more slowly leading to less [[collision]]s and the [[collision]]s which do happen occur with less [[force]]. | ||
Revision as of 21:18, 7 April 2019
Key Stage 3
Meaning
Atmospheric Pressure is the pressure on an object due to the particles of gas in the atmosphere colliding with the object.
About Atmospheric Pressure
- Atmospheric Pressure changes with height above the Earths surface. The higher up, the lower the pressure.
- The atmospheric pressure at sea level is 101,000Pa.
- The force responsible for atmospheric pressure is the weight of all the particles above the object.
Variation with Height
- As the height of an object increases the atmospheric pressure decreases.
- Pressure in a fluid is due to the weight of the fluid above the object. As an object gets higher, there is less atmosphere above that object.
- The reduction in pressure is related to the density and motion of particles in the atmosphere.
At higher altitudes:
- The atmosphere is less dense - Less frequent collisions between the particles and the surface of the object.
- The temperature is colder - Particles move more slowly leading to less collisions and the collisions which do happen occur with less force.