Difference between revisions of "Convection"

Latest revision as of 15:12, 3 December 2019

Key Stage 3

Meaning

Convection is a process where thermal energy is transferred in a fluid due to particles moving from hotter regions to cooler regions.

About Convection

Convection happens in fluids (liquids or gases) because particles can move past one another.

When a fluid is heated particles move more quickly and spread further apart. This makes the fluid less dense. The less dense fluid rises. After the fluid has moved away from the heater it cools down, the particles move more slowly coming closer together. This makes the fluid more dense so it sinks back towards the heater.

Examples


A Convection Current caused by a heat source.	A Convection Current caused by a heat sink.

Examples in the Particle Model


A Convection Current in the particle model caused by a heat source.	A Convection Current in the particle model caused by a heat sink.

References

@@ Line 4: / Line 4: @@
 ===About Convection===
+: [[Convection]] happens in [[fluid]]s ([[liquid]]s or [[gas]]es) because [[particle]]s can move past one another.
+: When a [[fluid]] is [[heating|heated]] [[particle]]s move more quickly and spread further apart. This makes the [[fluid]] less [[density|dense]]. The less [[density|dense]] [[fluid]] rises. After the [[fluid]] has moved away from the heater it cools down, the [[particle]]s move more slowly coming closer together. This makes the [[fluid]] more [[density|dense]] so it sinks back towards the heater.
+{| class="wikitable"
+|-
+|[[File:Convection.gif|center|]]
+|}
+===Examples===
+{| class="wikitable"
+|-
+|[[File:ConvectionHeater.png|center|400px]]
+|[[File:ConvectionCooler.png|center|400px]]
+|-
+| style="height:20px; width:400px; text-align:center;" |A [[Convection Current]] caused by a heat source.
+| style="height:20px; width:400px; text-align:center;" |A [[Convection Current]] caused by a heat sink.
+|}
+===Examples in the Particle Model===
+{| class="wikitable"
+|-
+|[[File:ParticleConvectionHeater.png|center|400px]]
+|[[File:ParticleConvectionCooler.png|center|400px]]
+|-
+| style="height:20px; width:400px; text-align:center;" |A [[Convection Current]] in the [[Particle Model|particle model]] caused by a heat source.
+| style="height:20px; width:400px; text-align:center;" |A [[Convection Current]] in the [[Particle Model|particle model]] caused by a heat sink.
+|}
+===References===
+====AQA====
+:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac70 ''Convection, page 15, GCSE Physics; The Revision Guide, CGP, AQA '']
+:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Convection, page 35, GCSE Combined Science Trilogy; Physics, CGP, AQA '']
+:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Convection, page 36, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']
+:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Convection, pages 12, 26-7, 30-1, GCSE Physics; Student Book, Collins, AQA '']
+====Edexcel====
+:[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Convection, page 38, GCSE Physics, Pearson Edexcel '']
+====OCR====
+:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Convection, pages 84, 85, Gateway GCSE Physics; The Revision Guide, CGP, OCR  '']