Science 4 Quarter 3 - Heat Transfer : Conduction, Convection and Radiation

hello grateful learners welcome to our online class i hope you are as ready as i am to start learning and have fun today we're going to talk about the heat transfer and it's different ways on how to transfer the heat like conduction convection and radiation [Music] are you wondering how did this happen melting of batter boiling of water and drying of wetlands well we all know that it happens if they are exposed to heat but how does the heat travels to each material let us identify first the molecules of solid liquid and gas you only have 30 seconds to answer [Music] [Music] [Applause] do [Music] let us now check your answer the second picture is the solid molecules wherein it held in fixed pattern but vibrating and the third picture is the liquid molecules the molecules pack closely together in a random fashion but they are free to move the first picture shows the gas molecules which widely separated and move at a great space let us now proceed in discussing heat or init is a form of energy associated with the motion of particles particles and it is capable of being transmitted or kaianito say but like for example capacity solid and liquid it is true by conduction and convection and through empty space it is by radiation heat is also called a thermal energy but how heat travels [Music] [Music] then how does heat travel in solid yes it is through conduction the heat energy is transferred through direct contact my physical [Music] like for example the metal frying pan that is exposed to fire in it [Music] frying pan some example of conduction is when frying meat so when frying meat the meat becomes hot [Music] the heat from a hot coffee makes the cup itself hot and the metal spoon becomes hot from the boiling water inside the cup [Music] there are materials that aren't good conductors conductors are materials that allow heat to flow through easily so like for example metals these metals could be made of iron aluminum nickel silver steel alloy copper coke and many more that's why yumangagi nagamet sakosina napangaluto ai and as well as stone and water are good conductors we also have insulators this are the materials in which heat passes slowly or not at all [Music] like for example glass plastic ceramic paper wood fabric rubber and foam other way on how the heat transfer through liquid materials is called convection convection is a transfer of heat from one place to another by movement of fluids so convection and fluids are phase of matter that includes liquids gases and plasma convection involves the motion of fluids and currents wherein the warm molecules will rise and cold molecules will sink and continuously moving it is called the convection current example of convection current is when we boil water [Music] because it is the nearest area that the molecules could pass its heat energy [Music] and water molecules [Music] cold [Music] remember that convection current cause a circular motion or fico and it follows also the trend of heat transfer which is from hat to cold other example of convection is a hot air balloon pinata [Music] [Music] other example of convection is the sea breeze and land trees [Music] the third way is the heat transfer through air and it is called the radiation rejection means that the transfer of heat is in the form of waves across empty space or vacuum without any medium ibix [Music] energy example of radiation is when we have campfire so we feel the heat from the campfire even in a distance and the heat and irradiation is called the radiant energy other examples of radiation are the following sunlight from the sun to the earth taking an x-rays and baking in a microwave radiation enragent energy is an object is an object it is because the electromagnetic waves carry the energy towards the other object let's try this identify the following heat transfer whether it is true conduction convection or gradation [Music] first picture baking in an oven second picture frying an egg third picture sand baiting on the beach and four boiling of water you only have 30 seconds to answer [Music] [Music] do [Music] and now let's check your answer [Music] very good great for learners and now let's try this last activity all you have to do is identify the methods of heat transfer in the given illustration [Music] let's check your answer [Music] [Applause] see you again and keep safe everyone

Channel: Miss Becca

Views: 94,502

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Id: VaYL-p1FABU

Length: 11min 48sec (708 seconds)

Published: Sat Apr 24 2021