 
 <prompt> Wetin be constant? Based on di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Faraday constant F na di charge of one mole of electrons, wey equal to Avogadro constant NA multiplied by di elementary charge e. You fit determine am by careful electrolysis experiments, wey involve measuring di amount of silver wey dissolve from one electrode for one specific time and electric current. For practical purposes, e dey measured for conventional electrical units, and so e get di symbol F90. If you substitute di definitions of NA and e, and convert from conventional electrical units to SI units, e go give you di relationship to di Planck constant.``` 