what is the triple point
a specific temperature in which a substance can exist in all three states in thermodynamic equilibrium
what is thermal equilibrium
a state in which there is no net flow of thermal energy between the objects involved so they are all at the same temperature
what is the zeroth law of thermodynamics
if 2 objects are in thermal equilibrium with a 3rd, then all three are in thermal equilibrium
what is the internal energy of an object
the sum of the randomly distributed kinetic and potential energies of the particles within a substance
define absolute zero
where substances have minimum internal energy
latent heat of fusion
change in enthalpy from providing energy (usually heat) to a substance to change its state from solid to a liquid at constant pressure
latent heat of vaporization
energy absorbed in the process of a liquid becoming a vapour
