What is the free energy at the triple point?
The general rule is that at fixed temperature and pressure the material will end up in a form which gives it the lowest free energy, “G”. At the triple point the liquid, solid, and gas have the same G per molecule.
What does the triple point indicate?
In thermodynamics, the triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. It is that temperature and pressure at which the sublimation curve, fusion curve and the vaporisation curve meet.
What is triple point of reaction?
Triple Point Explained: In physics and chemistry, the triple point of a substance is the temperature and pressure at which three phases (gas, liquid, and solid) of that substance may coexist in thermodynamic equilibrium.
What is triple point and critical point?
The critical point and the triple point of a substance are two important combinations of temperature and pressure. The critical point of a substance lies at the endpoint of the phase equilibrium curve whereas the triple point is the point where the three equilibrium curves meet.
What are the properties of Gibbs free energy?
Gibbs free energy, denoted G, combines enthalpy and entropy into a single value. The change in free energy, ΔG, is equal to the sum of the enthalpy plus the product of the temperature and entropy of the system.
Why is Gibbs free energy continuous?
Because the temperature is above the triple point, the free energy follows a continuous path (even though it is not everywhere differentiable) from gas to liquid to solid.
Which processes occur at the triple point?
At the triple point, all three phases (solid, liquid, and gas) co-exist. The processes that are occurring are condensation and vaporization, sublimation and deposition, and freezing and melting.
What is the significance of the triple point in a phase diagram?
The triple point represents the combination of pressure and temperature that facilitates all phases of matter at equilibrium. The critical point terminates the liquid/gas phase line and relates to the critical pressure, the pressure above which a supercritical fluid forms.
What is the difference between triple point and eutectic point?
The key difference between triple point and eutectic point is that at the triple point, three phases of a substance exist in equilibrium, whereas at the eutectic point, a particular eutectic mixture freezes or melts.
What is the purpose of defining the Gibbs free energy?
The Gibbs free energy is one of the most important thermodynamic functions for the characterization of a system. It is a factor in determining outcomes such as the voltage of an electrochemical cell, and the equilibrium constant for a reversible reaction.