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 Enthalpy in phase changes Entropy in phase changes
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The increased separation of the
particles also means that translation and rotation are
essentially unhindered and particles spin and stretch with
abandon. This results in even more energy dispersion in the gas
phase and so the entropy is once again larger than in the liquid
state.
  These phase changes and the accompanying changes in enthalpy and entropy are obviously affected by temperature but pressure is an important factor in the change from liquid to gas and also in sublimation (the change from solid to gas). Increased pressure on a sample can impede the kinetic motions of particles and thus inhibit their separation. Melting, boiling and sublimation temperatures are therefore affected by external pressure. Of the three, melting is affected the least. |
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