P1 energy for the home IN PROGRESS Flashcards
(139 cards)
Temperature is a measure of what?
Hotness
What happens to a substance when it is heated
It gains kinetic energy (KE)
If there is a difference in heat what will happen?
The energy will flow between them
The greAter the heat difference equals what..
Faster rate of cooling or heating.
What does specific heat mean
It tells you how much energy stuff can hold
What is waters specific heat capacity ?
4200 j/kg/Celsius
Energy=
Mass x specific heat capacity x temp change
How do you break intermolecular bonds?
Use heat
When a substance is condensing or freezing what happens?
Bonds are formed and energy is released
What is specific latent heat
It’s the energy needed to change heat
Other formulae for energy
Mass x specific latent heat
Where does conduction occur
Mostly in solids
Define conduction of heat
It is the process where vibrating particles pass on Extra kinetic energy to neighbouring particles
Why do metals conducts heat well.
Because some of their electrons are free to move inside the metal
Where does convection occur
In liquids and gasses
Define convection
More energetic particles move from hot to cold and take heat energy with them
Radiators in homes what do they do?
Use convection to heat rooms
What is radiation?
Heat from the sun
Name the three ways heat can be transferred
Conduction
Convection
Radiation
What makes radiation different
It does not need a material to travel in fin works in a vacuum
It only happens in transparent things such as air, glass and water
What emits radiation?
All objects
Are Matt black surfaces good or bad absorber and emitters?
Good
Light coloured smooth and shiny objects are goor or bad are emitting and absorbing?
Bad they reflect but don’t absorb or emit
What is heat radiation good for?
Cooking