Other slides in this set

Slide 2

Preview of page 2

Here's a taster:

Infrared Radiation
· Involves the transfer of heat energy by
electromagnetic radiation.
· No particles of matter are involved.
· All objects emit and absorb infrared radiation (IR).
· The hotter an object is, the more IR it emits.
· The amount of radiation an object emits or absorbs
depends on surface, shape and dimensions.
· Different materials transfer energy at different rates.
· Dark, matt surfaces emit and absorb more IR than
light, shiny surfaces which are good reflectors of IR.…read more

Slide 3

Preview of page 3

Here's a taster:

Kinetic Theory
· Explains different states and
properties of matter in terms of the
movement of particles.
· Particles of gases, liquids and solids
have different amounts of energy.
· In gases, particles move very quickly
in random directions, colliding with
each other.
· Increased temperature makes them
move faster.
· Decreased temperature makes the
particles move slower, come closer
together and start to form a liquid.
· Eventually it becomes a solid; the
particles now only move/vibrate in a
fixed position. They are all in an
orderly pattern.…read more

Slide 4

Preview of page 4

Here's a taster:

Conduction
· The transfer of heat energy
without the substance
moving.
· Metals are good
conductors; as the metal
heats the particles vibrate
more vigorously.
· The additional energy is
transferred to the cooler
areas of the metal by free
electrons.
· Insulators have few/no free
electrons so can't transfer
heat energy easily.…read more

Slide 5

Preview of page 5

Here's a taster:

Convection
· The transfer of heat energy
through the movement of
particles.
· Occurs in liquids and gases,
creating convection currents.
· Particles nearest the energy
source move faster; the
substance becomes less
dense.
Radiator
· The warm substance rises,
becoming cooler. It becomes
denser and eventually sinks.
· The denser substance moves
into the space near the heat
source and the cycle repeats.…read more

Slide 6

Preview of page 6

Here's a taster:

Evaporation and Condensation
· Evaporation is the
transfer of energy at a
liquid's surface.
· Atoms at the surface
move more quickly
and escape as a gas.
· When water
evaporates, it becomes
water vapour.
· The opposite is
condensation ­ when
a gas returns to a
liquid state.…read more

Slide 7

Preview of page 7
Preview of page 7

Slide 8

Preview of page 8
Preview of page 8

Slide 9

Preview of page 9
Preview of page 9

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »