Glossary :: Geochemistry

Enthalpy
A measure of internal energy of a system. For a gas:
H=E+pV
Where H is the enthalpy, E is the internal energy, p is the pressure and V is the volume.
Entropy
In thermodynamics entropy is the amount of energy not available to do work.
Gibbs Free Energy
Chemical reactions can be made to do work (e.g. produce heat). Energy which is, or which can be, available to do useful work is called Gibbs free energy (G).G = H - TS Where H is the enthalpy, S is the entropy, and T is the absolute temperature. ...More
Supersaturation
Supersaturation is the dissolving of a larger quantity of solute in a solution than would normally be possible. For example sea water is supersaturated with respect to carbonate by a factor of 3 or 4.

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