Thermal properties of matter Flashcards
define heat capacity
is the amount of energy needed to raise its temperature by one Kelvin
heat capacity formula
C = E△T
define specific heat capacity
of a certain substance is the amount of energy needed to raise the temperature by one kilogram by one Kelvin
specific heat capacity formula
c = E/m△T
Thermal energy transfer formula
mc△T
Latent heat
define and SI unit
The energy transfer associated with a change in state at constant temperature
Joules
Latent heat of fusion
define and SI unit
Energy transferred when there is a change in state between solid and liquid due to difference in potential energy of molecules
J/kg
Latent heat of vapourisation
define and SI unit
Energy transferred when there is a change in state between liquid and gas due to difference in potential energy of molecules
J/kg
Specific latent heat of fusion
define and formula
the amount of thermal energy needed to change the state of 1kg of substance from solid to liquid at constant temperature
E = mlf
Specific latent heat of vaporisation
define and formula
the amount of thermal energy needed to change the state of 1kg of substance from liquid to gas at constant temperature
E = mlv
Thermal equilibrium
A state when 2 or more objects have same temperature, no net transfer of energy between them
Boiling
Occurs at definite temperature, accompanied by bubbles that form within the liquid containing the gaseous form of the substance
Evaporation
Occurs at all temperatures where a few energetic particles of a liquid may escape and become gas particles
Factors affecting evaporation (6)
- temperature
- SA
- wind/drought
- humidity
- pressure
- boiling point
melting
The change from solid state to liquid state when energy is transferred to the substance without a chnage in temp
