Conduction And Convection

Question 1

what is convection

Answer 1

the movement of energetic particles from hotter to cooler regions

Question 2

what can convection happen in

Answer 2

liquids and gases

Question 3

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

Answer 3

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

Question 4

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

Answer 4

move

Question 5

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

Answer 5

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

Question 6

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

Answer 6

it causes the density of the region being heated to decrease

Question 7

how is a convection current created

Answer 7

• 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

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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

Question 10

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

Answer 10

• 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

Question 11

what is conduction

Answer 11

the process where vibrating particles transfer energy to neighbouring particles

Question 12

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

Answer 12

• 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