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Physics 1 - Motion, Forces And Conservation Of Energy > Conduction And Convection > Flashcards

Flashcards in Conduction And Convection Deck (12)
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what is convection

the movement of energetic particles from hotter to cooler regions


what can convection happen in

liquids and gases


what happens when energy is transferred by heating to the thermal energy stores of a liquid or gas

the thermal energy is shared across the kinetic energy stores of the gas or liquid's particles


unlike particles in a solid, what can the particles in a liquid or gas do



what happens when you heat a region of a gas or liquid

the particles have more kinetic energy (move faster and vibrate more vigorously) so the space between each particle increases


what is the effect of causing the particles in a gas or liquid have more kinetic energy and space out

it causes the density of the region being heated to decrease


how is a convection current created

- liquids and gases can flow
- warmer and less dense regions rise above denser cooler regions
- a constant heat source heats up the particles at the bottom and the ones at the top cool down
- the newly heated particles rise above the cooled ones as theyre now less dense
- the cycle repeats


what does a home radiator rely on to heat a room up

the creation of a convection current in the air of the room


what is the effect of air particles colliding with the surface of a hot radiator

energy is transferred from the radiator to the nearby air particles by conduction


what happens after air particles have collided with the surface of a hot radiator

- air by heater becomes warmer and less dense
- warm air rises and is replaced by cool air
- cool air heated by radiator
- previously heated air transfers energy to surrounding furniture and walls so it cools
- cooled air is more dense so it falls
- cycle repeats


what is conduction

the process where vibrating particles transfer energy to neighbouring particles


explain the transfer of energy when a solid object is heated up

- heat source transfers energy by heating to thermal energy stores of object
- energy shared across kinetic stores of particles
- (thermal heat gives particles energy to vibrate)
- vibration transfers kinetic energy to surrounding particles (conduction)
- vibrations of particles radiate heat to surroundings