Heat Transfer Mind Map

Heat-Transfer-Mind-Map
Conduction
Definition
flow of heat
high to low temperature
without movement of matter as a whole
energy transferred by particle collisions
Medium
Solids - best conductors because particles
joined together
Good conductor
Metals because of
free electrons
Bad conductors
(Insulators)
Air
Foam, expanded polystyrene, jablo, feathers
etc. - all trap air so very good insulators
Gases - worst conductors as particles are far
apart
ConVection
Definition
from high to low temperature
flow of heat
with movement of fluid as a whole
Medium
in fluids (liquids and gases)
Convection Current (Flow)
Hot air rises
Expands so less dense
Cold air sinks
More dense
Radiation
Definiton
Flow of heat
From high to low temperature
by electromagnetic waves
Medium
Solids, Liquids and Gases
Passes through a vacuum (no air)
Colours
Matt Black - best absorber and emiitter
Shiny Silver - worst absorber and emitter -
very good reflector
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