1. Important Notes - Heat Transfer
(for the explanation of the daily examples)
Conduction
1
2
3
______________ is a (good/poor) (conductor/insulator) of heat.
It prevents heat (loss/gain/exchange) from ___________ to __________ by conduction. OR
It transmits the energy away more (slowly/quickly).
[Result] i.e. Our body would feel warm.
good conductor = poor insulator
poor conductor = good insulator
Convection
1
2
3
Hot ________ from ________ expands and rises. OR
Cold ________ from ________ sinks.
The surrounding cooler __________ will replace the warm ___________. OR
This push the warm _________ up.
Convection current is set up. __________ will be (heated/cooled) quickly and evenly. OR
_______________ is to prevent heat (loss/gain/exchange) from ___________ to __________
by convection.
Radiation
1
2
3
_____________ is a (good/poor) (radiator/absorber) of heat.
It prevents heat (loss/gain/exchange) from _________ to _________ by radiation. OR
It can (absorb/radiate) energy more (slowly/quickly) by radiation. OR
It reflects energy away from __________.
[Result] i.e. The tank will not be overheat by ______________.
The body will not be so (hot/cold)
good radiator ≠ poor absorber
The cooking time will be (shorter/larger)
poor radiator ≠ good absorber
T > Ts
T < Ts
Dull Black
Object
GOOD
radiator/emitter
GOOD
absorber
Shiny/Silvery
Object
POOR
radiator/emitter
POOR
absorber
** T = Temperature of the object
Ts = Temperature of the surroundings
Material (Metal/Non-metal) – Conduction
Position (Top/Bottom) – Convection
Colour (Black/Silvery) – Radiation