DAJB+1.2

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Vocabulary

 * heat transfer**:The movement of energy from a warmer object to a cooler object.
 * radiation**:The transfer of energy through empty space.
 * conduction**:Heat transfer by direct contact of particles of matter.
 * convection**:Heat transfer by the movement of a heated fluid.
 * density**:is the measure of how much mass there is in a volume of a substance.
 * convection currents**:is the flow that transfers heat within a fluid

Outline
=**Radiation**=
 * Heat transfer with no direct contact.
 * An example of Radiation is the heat you feel around a flame or open fire or from the sun.

=**Conduction**=
 * Particles near the heat source vibrate faster as they are heated, so they bump into other particles and heat them too.
 * An example of conduction is a spoon in a hot pot.

=**Convection**=
 * When a liquid or a gas is heated particles move faster.
 * Particles spread apart as they move faster
 * If gas or liquid is cooled, particles move slower and settle closely together.
 * An example of convection is the bottom of a pot being heated get hot it expands and becomes less dense.
 * Differences of temperature and density within a fluid cause convection currents.