Rate law is a description of how the rate of a reaction depends on its concentration.
\(r = k [ A ]^m [ B ]^n [C]^p ldots
\)r\( = rate law
\)k\( = specific rate constant for the reaction is fixed for any single reaction at a given temperature
\)[ A ] \( = A, B and C are concentrations of different molecular species
\) m $ = m, n and p are reaction orders