| Ai | i-th substance | 
| vi | stochiometric coefficients of i-th substance | 
| K | dissociation constant (activity based) | 
| a(Ai)=fi*xi | activity of the substance A | 
| fi | activity coefficient of the substance A | 
| xi | mole fraction of the substance A | 
| ΔfHi | molar enthalpy of formation of i-th substance | 
| ΔfGi | molar Gibbs energy of formation of i-th substance | 
| ΔfSi | molar entropy of formation of i-th substance | 
| Δrω | change of number of microstates of particles by reaction | 
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