P2 Flashcards
How does heat go through a solid?
Conduction
How does heat go through a liquid/gas
Convection
How does heat go through a vacuum
Thermal radiation
How does conduction work
When particles vibrate they knock into adjacent particles and transfer energy (heat)
How does convection work
Hot fluid is less dense so rises, and cold fluid falls
What type of radiation does the sun use to transfer heat
Infared radiation (light)
What type of wave is light
Electromagnetic
What surfaces reflect light/radiation
Lightly coloured, shiny surfaces
What surfaces absorb radiation
Dark, matte surfaces
Why are some objects white
They reflect all visible light (radiation)
What materials are good insulators of heat
Plastic
What materials are good conductors of heat
Metal
What does a good conductor have
A high thermal conductivity
What does a good insulator have
A low thermal conductivity
What is specific heat capacity
The energy needed to raise the temperature of 1kg of a substance by 1^C
What is the equation for temperature rise with energy as the subject
Energy (j) = mass (kg) * specific heat capacity (j/kg^C) * temperature change (^C)
What is the triangle for the equation
E over m * c * theta
How do you rearrange it with mass as the subject
m = E over c * theta
How do you rearrange it with specific heat capacity as the subject
c = E over m * theta
How do you rearrange it with temp change as the subject
Theta = E over m * c
What is E
Energy
What is energy measured in
Joules (J)
What is m
Mass
What is mass measured in
Kg
