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what is fusion
freezing or melting
what is vaporisation
condensation
what is sublimation
the process of direct conversation of a solid into gas phase
sublimation= fusion + vaporisation
what does fusion (melting) require
requires the input of energy and is endothermic
what direction does phase transition occur in
in the direction of lower free energy
Gibbs phase rule
F= C - P + 2
where F is the number of degrees of freedom
C is the number of components
P is the number of phases
measurement if heat effects
differential scanning calorimetry
used by virtually all pharmaceutical companies
sample is heated in a small aluminium pan and the heat change noted as a function of temperature
energy difference between sample and reference measured
