energy Flashcards
conduction, convection, radiation, insulation, energy transfer
conduction is the main method of energy transfer in
solids
non metals and glass are _____ conductors of heat
bad
metals are ____ conductors of heat
good
conduction happens when
2 different solids of different temp come into contact with each other and energy is transferred from the thermal store of the hotter object to the cooler object.
why are metals good conductors of heat
they have delocalised electrons
how is energy transferred in conduction
through the vibration of atoms in solids
energy is transferred by the process of heating and radiation by three processes
- convection
- conduction
- radiation
poor conductors are called
insulators
insulators do what
they block conduction from happening
convection is the main way of energy transfer in
fluids
can convection happen in solids
no
convection currents ( what happens)
When a fluid (a liquid or a gas) is heated:
- The molecules push each other apart, making the fluid expand
- This makes the hot fluid less dense than the surroundings
- The hot fluid rises, and the cooler (surrounding) fluid moves in to take its place
- Eventually, the hot fluid cools, contracts and sinks back down again
- The resulting motion is called a convection current
all bodies emit thermal radiation true or false
true
the hotter the object, the ___ infrared radiation it emits in a given time
more
The colour of an object affects how well it emits and absorbs thermal radiation, what colour works best
Black objects are the best at emitting and absorbing thermal radiation
Shiny objects are the worst at emitting and absorbing thermal radiation
