heat transfer Flashcards
absorb
to take in energy
condense
when gas turns to liquid
conduction
the way heat travels through solids. the energy will make the particles vibrate and hit eachother, creating a knock on effect and the energy will travel up the solid. metals have free electrons which can move around and aren’t fixed like the other particles. These free electrons transfer energy faster as they can move between the fixed particles quickly.
contract
get smaller
emit
to give out energy
convection current
a current created by heat causing changes in the density of a fluid. as the substance looses density it will expand and become liter than the surroundings and rise, as it rises away from the heat source it will cool and come back down, this will then push more fluid towards the heat and so on.
evaporate
liquid turns to a gas.
gas
particles that are spread out and not connected
heat insulator
materiel that doesn’t let heat energy travel through it easily.
infrared radiation
a wave that can travel through transparent things and vacuums.
insulator
a materiel that doesn’t let energy flow them easily.
joules
the units for measuring energy.
melt
when a solid turns to a liquid.
radiation
the transfer of energy through waves.
solid
made of particles that are fixed to and vibrate around eachother.
liquid
something made of particles that are touching in an irregular array and can move past eachother.
thermal energy
heat energy
heat transfer
cold doesn’t exist it is a lack of heat and heat will flow from warmer objects to colder objects- the closer they get to eachother in temperature, the slower the flow. e.e. when you are in room below your body temperature, heat will flow from you into the room.
boiling and freezing points
boiling and freezing points differ depending on the pressure and altitude.
heating molecules
the less molecules there are to heat, the hotter the substance becomes.
