Heat Transfers Flashcards
What is conduction?
The transferral of heat from one area to another.
What happens during conduction in a metal?
The particles are very close together and touching. When part of the metal is heated, this causes the particles to absorb the heat energy and start to vibrate. These particles then bump into the ones next to them, transferring the energy and thus the heat spreads.
What is infrared radiation (IR)?
A type of electromagnetic wave.
How is radiation used in heat transfer?
All objects transfer thermal energy by infrared radiation.
Are particles required for radiation?
No.
Can radiation transfer heat through a vacuum?
Yes.
What is convection?
When particles with lots of thermal energy take the place of particles with less energy.
What happens to air when it is heated?
It expands.
What happens when air expands?
The same mass occupies a larger volume.
What happens to the warmer air during convection?
It rises, because it is less dense than the cooler air around it.
Why doesn’t convection occur in solids?
Because the particles are in a fixed position.
What does it mean when something is dense?
There are more particles in the area.
How does air move during convection?
Around the room/area in a continuous loop.
