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Physics P1 - Energy Transfer by Heating
- infrared Radiationi
- Form of
electromagnetic wave
- Emitted by all objects
- Detected as
heat
- Form of
electromagnetic wave
- Surfaces and
Radiation
- Black matt surfaces both emit
and absorb IR the best
- White shiny surfaces are the
worst absorbers and emitters
of IR
- Black matt surfaces both emit
and absorb IR the best
- States of
Matter
- Solid
- Particles in uniform format,
vibrating in a fixed position
- Particles in uniform format,
vibrating in a fixed position
- Liquid
- Particles move
about at random
- Still in contact with
each other
- Particles move
about at random
- Gas
- Move about randomly
with high kinetic
energy
- Particles much further
apart and not in contact
- Move about randomly
with high kinetic
energy
- Solid
- Conduction
- Conduction in Metals
- Metals are best
conductors
- Delocalised free electrons transfer vibration
down the material by colluding with the other
particles
- Metals are best
conductors
- Insulator- Poor
conductor
- Particles near the heat source gain kinetic
energy and vibrate more. This movement
is passed on to neighbouring particles
- Conduction in Metals
- Convection
- Occurs in
fluids
- Heating causes the fluid to become
less dense, therefore it rises and is
replaced by the cooler particles
- Causes convection
currrent
- Causes convection
currrent
- Occurs in
fluids
- Evaporation and Condesation
- Evaporation
- When a liquid
turns into a gas
- Particles with the highest
kinetic energy escape, taking
energy with it, causing
cooling
- Rate increased
by
- Increasing surface
area of liquid
- increasing
temperature of liquid
- Draught across
surface
- Increasing surface
area of liquid
- When a liquid
turns into a gas
- Condensation
- When gas
turns to liquid
- Rate increased
by
- Increasing surface area
- Reducing surface
temperature
- Increasing surface area
- When gas
turns to liquid
- Evaporation
- Energy Transfer by Design
- Heat goes from
hot to cold
- Greater the temperature
difference between object
and surroundings, wuicker
energy is transfered
- Greater the temperature
difference between object
and surroundings, wuicker
energy is transfered
- Maximise
transfer
- Use good
conductors
- Matt
black
- Air flow
- Use good
conductors
- Minimise
transfer
- Use of
insulators
- White and shiny
- Trapped
air
- Use of
insulators
- Heat goes from
hot to cold
- Specific Heat
Capacity
- Energy required to heat 1kg
of a substance by 1 degree
- Greater mass more
energy needed
- Greater mass more
energy needed
- E=mass x SHC x temp.
change
- J/kg(o)C
- Energy required to heat 1kg
of a substance by 1 degree
- Heating and Insulating
Buildings
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