Heat Transfer A Closer Look Review From last

Heat Transfer- A Closer Look

Review From last class… n 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) n n n 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 n The better the conductor, the more rapidly the heat will transfer n

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

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

Conductors & Insulators n Objects that transfer heat quickly are called Conductors ¨ Ex: n 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) n When a fluid is heated it becomes less dense and becomes lighter so it rises n 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 n

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

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

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

Animations & Study https: //www. wisc-online. com/learn/naturalscience/earth-science/sce 304/heattransfer-conduction-convection-radiation n https: //quizlet. com/108429140/heattransfer-flash-cards/ n