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: 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]].