3.6.2.1: Thermal energy transfer Flashcards
Internal energy is…
Internal energy is the sum of the randomly distributed kinetic energies and potential energies of the particles in a body
How can the internal energy of a system be increased?
The internal energy of a system can be increased by transferring energy to it by either heating or doing work on it
What is the Zeroth law of thermodynamics?
Thermal equilibrium:
If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other
What is happening to the energies of a system during a change of state?
During a change of state, the potential energies are changing, but the kinetic energies are not
What equation is used for changes in temperature?
Q = mc ∆ θ
What is Specific heat capacity?
Specific heat capacity is the energy required to raise the temperature of 1Kg of a substance by 1K
What equation is used for changes in state?
Q = ml
What is specific latent heat?
Specific latent heat is the amount of thermal energy needed to change the state of 1Kg of a substance, without changing its temperature
What is the specific latent heat of fusion?
The amount of thermal energy needed to change the state of 1Kg of a substance from solid to liquid (or vice versa)
What is the specific latent heat of vaporisation?
The amount of thermal energy needed to change the state of 1Kg of a substance from liquid to gas (or vice versa)
