P2 Energy Transfer by Heating Flashcards
The equation for change of state
E=ml
E is the thermal to or lost by the body (J)
m is the mass of the body (kg)
l is the latent heat (Jkg-1)
What is equal to 0 Kelvin
-273°C
What is the lowest ever recorded temperature
0 Kelvin (-273°C)
Can Kelvin ever be negative
No
Latent heat
The energy transferred to or from a substance during its change if state
Internal Energy
The energy of the particles of a substance due to their individual motion (movement) and positions
Thermal
A form of energy, measured in joules (j)
Specific heat capacity of fusion
Energy needed to melt 1kg of a substance with no change of temperature
What are the best conductors of energy
Metals are the best conductors of energy
What are the best insluators
Non-metals, such as wool and fibre class are the best insulators
What links a materials thermal conductivity and the rate of energy transfer
The higher the thermal conductivity of the material the quicker the rate of energy transfer through it
What is the effect of a the thickness of an insulatoring
The thicker a layer of insulating material is, the lower the rate of energy transfer through it.
Which sort of objects emit and absorbs infrared radiation?
All objects absorb and emit infrared radiation
How does the temperature of an object effect the amount of infrared radiation emitted
The hotter the object is, the more infrared radiation it emits in a given time
What’s black body radiation
Radiation emitted by a body that absorbs all the radiation incident on it (no other object emits or absorbs radiation as effectively as a perfect black body).
