Thermal Energy & Heat Ch. 16 Intro to Physics.

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Presentation transcript:

Thermal Energy & Heat Ch. 16 Intro to Physics

Thermal Energy and Matter Total energy particles Mass, temp., phase

Heat Transfer thermal energy How flow? Temperature KE Collisions

Heat Transfer Conduction No transfer matter Particle collision Metals Free flowing electrons Conductor Insulator

Heat Transfer Convection Movement of particles in fluids Currents

Heat Transfer Radiation Waves through space

Thermodynamics 1st Law 2nd Law 3rd Law Energy conserved Heat flow from Hot to cold unless work done to force Can’t get as much energy out as put in Entropy universe increasing 3rd Law Entropy of a perfect crystal at 0 K is 0 "It is impossible by any procedure, no matter how idealized, to reduce the temperature of any system to zero temperature in a finite number of finite operations".[

Thermal Expansion and Contraction

Specific Heat Q = mcDT Example P. 477 Calorimeter

Heat Engines External Combustion Internal Combustion

Read Section 16.3

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