GCSE Physics - Conduction

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  • Created on: 31-12-12 15:37
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Physics Revision
Important Definitions
HEAT : Total energy contained in an object
TEMPERATURE: Average kinetic energy of a particle
HEAT always travels FROM HOT TO COLD
Example
1000°c
90°c
This pin at a HIGH TEMPERATURE The bath at LOWER TEMPERATURE so
has very FEW PARTICLES but each each PARTICLE has LESS ENERGY but
PARTICLE HAS A LOT OF ENERGY there are more particles in the bath
so in total it has MUCH MORE ENERGY
Heat Transfer
Heat travels in three ways:
CONDUCTION, CONVECTION and RADIATION
Conduction
Happens in solid objects
Object which heat passes through quickly is a CONDUCTOR
Object which heat passes through slowly is an INSULATOR
Metals are GOOD CONDUCTORS
When the PARTICLES in a solid get HOT they VIBRATE. They pass EXTRA
KINETIC ENERGY onto their neighbours.
METALS have FREE ELECTRONS, which move quickly through the metal,
HITTING other PARTICLES and PASSING HEAT ON MORE QUICKLY

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COLD FEET
The tiles feel colder because they conduct heat out of your feet better than
the carpet does.…read more

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