890486
science -heating
& cooling
- CONDUCTION= metals are good
conductors because the particles are
close together so its easier for the heat to
travel and pass on whilst the particles are
vibarting and touching each other.
- Thermal energy can be transferred by :
conduction, radiation and convection
- Substances that do not allow thermal
energy through easily are called insulators
- CONVECTION= happens when particles (in
liquids or gases) move and take the place of
particles with less thermal energy. Thermal
energy is transferred from hot places TO cold
places by convection.
- Conduction and convection need moving particles to
transfer thermal energy but radiation does not.
- All objects transfer
thermal energy by
infrared radiation.
- RADIATION= the hotter , the more
infrared radiation it gives off. No
particles are involved with radiation.
Radiation is the way we can FEEL the
heat from the sun.
- Heat and temperature are different although they r both
- HEAT is measured in
joules (J) and the heat of an
object contains the amount
of its thermal energy
- TEMPERATURE is measured
in degrees celcius. The
temperature of an object is to
do with how hot or cold it is.
- ENERGY is very important. There are all
sorts of types of energy.
- In a sparkler there is a very
high temperature but not
much thermal energy.
- In a bath there's a lot of
thermal energy but low
temperature
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