Difference between revisions of "Atmospheric Pressure"

Revision as of 14:37, 11 February 2019

Atmospheric Pressure is the pressure on an object due to the particles of gas in the atmosphere colliding with the object.

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.

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.

@@ Line 7: / Line 7: @@
 : The '''atmospheric pressure''' at [[Sea Level|sea level]] is 101,000Pa.
 : The [[force]] responsible for '''atmospheric pressure''' is the [[weight]] of all the [[particle]]s above the [[object]].
+===Variation with Height===
+: As the height of an [[object]] increases the '''atmospheric pressure''' decreases.
+: [[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]].
+At higher [[altitude]]s:
+*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]].