Chapter 15: Thermal Energy Section 2: Heat.  *Heat: transfer of thermal energy from one object to another, when objects are different temperatures 

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Presentation transcript:

Chapter 15: Thermal Energy Section 2: Heat

 *Heat: transfer of thermal energy from one object to another, when objects are different temperatures  *Always moves from warmer  to cooler  arr+conduction&FORM=VIRE1#view=detail& mid=197E89FE20B92CFBD8E4197E89FE20B9 2CFBD8E4 arr+conduction&FORM=VIRE1#view=detail& mid=197E89FE20B92CFBD8E4197E89FE20B9 2CFBD8E4

 Conduction: transfer of thermal energy by direct contact  *Particle collide w/neighboring particles  *Occurs most easily in solids and liquids – molecules are closer

 Radiation: thermal energy transferred by electromagnetic waves  *Can occur in empty space and in solids, liquids, and gases  *Sun/fireplaces  warm objects emit more radiation than cool

 Convection: transfer of thermal energy by movement of atoms from one part of material to another  *Transferring Thermal Energy by Convection  *Boiling water  warm less dense water rises,  cooler water sinks (cycle – repeats)  3 Ways Heat Can Travel: Vn1c&list=PL170CF66C68FA97E0

 Conductors: any material that easily transfers thermal energy (metals)  Insulators: material that thermal energy does not flow through easily

 Specific Heat: of a material is amount of thermal energy needed to raise temperature of 1 kg by 1 degree Celsius.  *More thermal energy is needed for high specific heat material (water)  *Low specific heat (sand)  t+Explained&FORM=RESTAB#view=detail&mid=1BD5 66C81F3D9A58DC221BD566C81F3D9A58DC22