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GCSE PHYSIC By Aadeng Apang

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1 GCSE PHYSIC By Aadeng Apang
Convection GCSE PHYSIC By Aadeng Apang

2 What is convection ? Convection is the process in which heat is transferred in a substance by the actual movement of the heated particles. Convection takes place only in liquids and gas. The transfer of heat in convection is always vertically upwards. Physics World

3 Why is the transfer of heat by convection vertically upward ?
This is because the particles of the medium near the heat source gets heated and starts to move faster. Then, the heated medium expands and becomes less dense therefor it rises and take place of the medium above which is more denser. The denser medium then takes place of the less denser medium. Physics World

4 Convection Currents When liquid is heated the less dense warm liquid rises above the more dense cold liquid due to the particle vibrating and moving faster. This causes a circulation and convection current is formed in the process. The convection current continues till the entire medium has the same density and temperature. Physics World

5 Convection in Gases LAND BREEZE
During day time the air surrounding us gets heated by the sun and becomes warm and dense resulting it to rise up. The cool air from the sea replaces it Physics World

6 Convection in gases SEA BREEZE
At night the land cools down faster than the sea therefore the warm air from the sea rises up and is replaced by the cool air from the land. Physics World

7 Works Cited http://ap-physics.david-s.org/convection/
"Convection." BBC News. BBC, n.d. Web. 09 _2011/energy/heatrev1.shtmlNov "Heat Transfer." Heat Transfer. N.p., n.d. Web. 08 Nov. 2014http://hyperphysics.phy- astr.gsu.edu/hbase/thermo/heatra.html "Learnhive | ICSE Grade 9 Physics Transfer of Heat - Lessons, Exercises, and Practice Tests." Learnhive | ICSE Grade 9 Physics Transfer of Heat - Lessons, Exercises, and Practice Tests. N.p., n.d. Web. 09 Nov DAsh, S.K. "Google Books." Google Books Physics. N.p., n.d. Web. 07 Nov ( Icse Physics) "Convection." Definition of Convection. N.p., n.d. Web. 09 Nov Physics World

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