Heat Transfer- A Closer Look

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Presentation transcript:

Heat Transfer- A Closer Look

Review From last class… Did you…? Finish the Heat Transfer Graphic Organizer Put your name on it and hand it in Finish the Google Forum Quiz (still open to complete) What are some similarities of Conduction, Convection and Radiation? What are the differences? What are examples of each?

Conduction & Particle Theory Conduction is the transfer of heat between substances that are in DIRECT contact with each other The better the conductor, the more rapidly the heat will transfer

Conduction & Particle Theory In solids, particles are very close to one another and heat transfer is made directly from one particle to another Thermal conduction is the process of energy transfer by DIRECT collision between particles

Conduction & Particle Theory Particles that are hotter move faster and collide with slower moving particles causing them to speed up as well This continues until the object is evenly heated

Conductors & Insulators Objects that transfer heat quickly are called Conductors Ex: metals Objects that are poor conductors of heat are called Insulators Ex: glass, wood, brick, stone, fibreglass, styrofoam

Convection & Particle Theory Convection is the movement of heat in a GAS or LIQUID (Fluid) When a fluid is heated it becomes less dense and becomes lighter so it rises The colder fluid is more dense and heavier and sinks to the bottom to take the place of the gas or liquid that has risen

Convection & Particle Theory The circular current that is created in a fluid that has been heated is called a CONVECTION CURRENT

Radiation and Particle Theory Radiant Energy can take many forms: Radiowaves Microwaves Visible light waves Xrays Sources of radiation: Hot Objects

Radiation and Particle Theory All forms of radiant energy (radiation) have common characteristics They travel in waves or rays They can be absorbed or reflected They can travel through space (vacuum) at a speed of 300 000km/sec

Animations & Study https://www.wisc-online.com/learn/natural-science/earth-science/sce304/heat-transfer-conduction-convection-radiation https://quizlet.com/108429140/heat-transfer-flash-cards/