convection Flashcards
1
Q
convection is the main energy transfer in what?
A
fluids
2
Q
describe what happens in a convection current?
A
substance is heated- causes air particles to gain kinetic energy and rise and expand
these air particles become less dense and rise
then they become cooler- have less kinetic energy- move slower- they move closer together and become denser
they fall back towards the heat and are replaced by the new, warmer particles
3
Q
convection currents move hot air up as well as what…
A
also moving cool fluid down
4
Q
convection cannot occur in what?
A
solids
