Conduction - Heat transferred from warmer to cooler areas in solid objects.. Convection - Heat transferred through currents in liquids or gases.. Radiation - Heat transferred through inf
Trang 1Heat Transfer
1 Conduction - Heat transferred from warmer to cooler areas in solid objects
2 Convection - Heat transferred through currents in liquids or gases
3 Radiation - Heat transferred through infrared rays
In the oven, the metal tray
heats up and helps transfer
heat to the biscuits Metal is
a good conductor
Warm gas or liquid rises
Cooler gas or liquid sinks
The movement of the liquid
or gas is called a convection
current
Heat moves from the burner to the pot Most pots have plastic handles Wood and plastic are not good conductors They are called insulators
The air, which is a gas, is heated right in front of the heater
Warm air is lighter than cool air, so it rises Cool air comes down to take its place This then gets warmed and rises
Heat from the hot drink moves to the mug
A fish tank heater heats water Heat moves in a circular motion
Radiation is the spreading out of heat rays We feel heat from the Sun as it travels to the Earth by infrared rays
All objects give out and take in thermal radiation, which is also called infrared radiation The hotter an object is, the more infrared radiation it emits
We feel heat from
a light bulb as it radiates heat into the surrounding air
A fire is an example of radiant heat
No particles are involved in the process
of radiation, unlike conduction and convection Radiation can even work
in space