Heat Transfer Flashcards
Explain how heat us transferred by conduction in poor conductors like glass
Atoms are heated and gain energy
Vibrate more and with greater amplitude
Heat is transferred from on atom to the next as kinetic energy
Explain how heat is transferred by conduction in good conductors like metals
Copper is a better conductor because it has free electrons which move and collide into other atoms transferring heat energy quicker
The three main methods of heat transfer
Conduction
Convection
Radiation
Conduction
Occurs in solids
Heat is passed from particle to particle
Convection
Hot air rises, cool air falls to take its place creating convection current
Transfer heat in liquids and gases
Radiation
Happen in a vacuum
No particles needed
Best insulator
Glass
Brass
Best conductor
Copper
Controlled variable
Things kept the same
Dependent variable
What’s being measured
Independent variable
The difference like the different materials
Everyday examples of heat conduction
Pots and pans
Hot cup of tea
Dark Matt surfaces
Good at absorbing heat and radiating heat
Light shiny surfaces
Poor at absorbing heat and radiating heat
How Aluminium foil will reduce heat loss
The shiny will reflect back into the copper pipe
