convection Flashcards
1
Q
What is convection
A
Heat transfer in liquids + gases (moving particles)- the molecules are too far apart to allow heat by conduction
2
Q
how are convection currents set up in radiators?
A
Hot air rises and cold air drops
3
Q
why is underfloor heating good
A
larger area heated
several convection currents
4
Q
heating up
A
Particles are heated
gain kinetic energy, move apart
less dense: rise
5
Q
cooling down
A
particles cool lose
kinetic energy, move closer together
denser: drop
