Conduction And Convection In The Home

Question 0

Why are metals good heat conductors?

Answer 0

Some of their electrons are free to move
These collide with other free electrons, transferring energy
Quicker because can move freely

Question 1

What is conduction of heat?

Answer 1

Vibrating particles pass on extra kinetic energy to neighbouring particles
Occurs in solids

Question 2

Why do non metals heat more slowly?

Answer 2

Don’t have free electrons

Good insulators

Question 3

Why is air a good insulator?

Answer 3

Conducts heat slowly because particles aren’t held tightly together, so don’t bump into each other

Question 4

What is convection heating?

Answer 4

When more energetic particles move from hotter to cooler region and take their heat energy with them

Question 5

Explain the process of convection currents

Answer 5

Heated particles of gas or liquid move faster and expand
Become less dense
Rises above cooler denser surroundings
Warm fluid rises, cooler fluid takes its place creating circulation of convection currents

Question 6

Give 2 examples of convection heating being used in the home

Answer 6

Immersion heaters

Radiators heating a room

Question 7

How can you reduce convection?

Answer 7

Stop fluid moving

Eg clothes, blankets, cavity wall insulation all trap pockets of air which conduct heat very slowly