Conduction And Convection Flashcards Preview

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

Flashcards in Conduction And Convection Deck (12)
Loading flashcards...
1

what is convection

the movement of energetic particles from hotter to cooler regions

2

what can convection happen in

liquids and gases

3

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

4

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

move

5

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

6

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

7

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

8

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

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

9

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

10

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

11

what is conduction

the process where vibrating particles transfer energy to neighbouring particles

12

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