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Energy Transfer by Heating
· The bigger temperature difference between a body and it's
surroundings, the faster the heat energy is transferred from the
hotter material to the cooler material…read more

Slide 3

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Infrared Radiation
· All objects emit and absorb radiation
· The hotter an object, the more infrared radiation it radiates in a given time
· Dark, matt surfaces are good absorbers and good emitters of radiation
· Light, shiny surfaces are poor absorbers and poor emitters of radiation
· Light shiny surfaces are good reflectors of infrared radiation…read more

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Condensation
· When a gas/vapour is cooled sufficiently to a low enough
temperature to allow to attractive forces to be strong enough to
attract the particles together as a liquid
· Factors affecting the rate of condensation:
-the cooler the gas, the faster it condenses
-the lower the temperature of the surface
- the lower the airflow over the surface…read more

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Evaporation
· When the highest kinetic energy particles of a liquid escape from a
surface
· Can take place at any temperature between a substance's melting and
boiling point
· As the highest kinetic energy particles leave, the slower, lower kinetic
energy particles are left so the bulk of the liquid will cool- cooling effect
· Factors affecting the rate of evaporation:
-the higher the liquid temperature the faster the rate of evaporation
-the greater the surface area the faster the rate of evaporation
-the greater the air flow the faster the rate of evaporation…read more

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Conduction
· Particles vibrating against each other or collisions between particles
in a gas or liquid
· The more dense the solid, the better the conductor (particles are very
close to the rate of heat transfer)
· Metals are good conductors because of free moving electrons- they
can rapidly transfer kinetic energy by particle movement (much
better than vibrating atoms in non-metals which are in a fixed
position)
· Gases are poor conductors because their rate of heat transfer is
further apart…read more

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