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: Brownian Motion is [[Scientific Evidence|evidence]] of the [[Particle Model|particle model]] of [[matter]].: When viewed under a [[microscope]] small [[object]]s like a [[pollen]] grain or tea leaf seem to change direction randomly.: [[Brownian Motion]] can be [[explain]]ed if the small [[object]]s are being hit by other, even smaller [[object]]s that cannot be seen. This is [[Scientific Evidence|evidence]] that [[matter]] is made of [[particle]]s.{| class="wikitable"|-|[[File:Brownianmotion.gif|center]]| style="height:20px; width:200px; text-align:left;" |In this animation the grey [[particle]]s represent [[particle]]s too small to see. The yellow [[particle]]s represent [[particle]]s that are big enough to see and the blue lines show the random path of the yellow [[particle]]s.|} ==Key Stage 4=====Meaning===[[Brownian Motion]] is the seemingly random movement of very small, visible, [[particle]]s when viewed under a [[microscope]]. ===About Brownian Motion===: Brownian Motion is [[Scientific Evidence|evidence]] of the [[Particle Model|particle model]] of [[matter]].: When viewed under a [[microscope]] small [[object]]s like a [[pollen]] grain or tea leaf seem to change direction randomly.: [[Brownian Motion]] can be [[explain]]ed if the small [[object]]s are being hit by other, even smaller [[object]]s that cannot be seen. This is [[Scientific Evidence|evidence]] that [[matter]] is made of [[particle]]s.{| class="wikitable"|-|[[File:Brownianmotion.gif|center]]| style="height:20px; width:200px; text-align:left;" |In this animation the grey [[particle]]s represent [[particle]]s too small to see. The yellow [[particle]]s represent [[particle]]s that are big enough to see and the blue lines show the random path of the yellow [[particle]]s.|} ===References=======AQA====:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Brownian motion, page 87, GCSE Physics; Third Edition, Oxford University Press, AQA ''] ==Key Stage 5=====Meaning===[[Brownian Motion|Brownian motion]] is the random and unpredictable motion of a [[particle]] caused by collisions with [[molecule]]s of the surrounding substance. ===About Brownian Motion=== *[[Brownian Motion|Brownian motion]] demonstrates the [[Kinetic Theory|kinetic theory]] of [[matter]].*[[Brownian Motion|Brownian motion]] is observed as the erratic movement of [[particle]]s suspended in a [[fluid]].*[[Brownian Motion|Brownian motion]] provided early evidence for the existence of [[atom]]s and [[molecule]]s.*[[Brownian Motion|Brownian motion]] is described mathematically by the Einstein relation for [[diffusion]]. ===Examples=== *The random movement of pollen grains in water observed under a [[microscope]].*Used in determining [[Avogadro Constant|Avogadro's number]] by observing [[particle]] movement in a [[fluid]].