Heat Flashcards
(12 cards)
Conduction
The transfer of heat through a substance without the substance itself moving.
Convection
The transfer of heat through fluids by the upward movement of warmer, less dense regions of fluid.
Radiation
Transfer of energy by infrared waves.
Process of conduction
Heat makes the molecules vibrate. They pass on their extra vibrational energy to neighbouring molecules.
Why is metal a good conductor?
Contains many free electrons that can transfer energy throughout the solid.
Process of convection
Heated fluid rises, because less dense from vibration. Once fluid cools down, it becomes more dense and sinks.
What surfaces best absorb heat?
Dark and rough surfaces
What surfaces best emit heat?
Dark and rough surfaces
What surfaces best reflect heat?
Bright and polished surfaces
Specific heat capacity
Amount of energy required to heat 1kg of a substance by 1 degree celsius
Formula for specific heat capacity
Heat energy(J) / ( mass(kg) x change in temp(C) )
Formula for change in thermal energy
Mass(kg) x Specific Heat Capacity(J/kg C) x Change in temp(C)
