text: In chemical kinetics, a reaction rate constant or reaction rate coefficient () is a proportionality constant which quantifies the rate and direction of a chemical reaction by relating it with the concentration of reactants.
  For a reaction between reactants A and B to form a product C,
  where
  :A and B are reactants
  :C is a product
  :a, b, and c are stoichiometric coefficients,
  the reaction rate is often found to have the form:
  Here  is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the solution. (For a reaction taking place at a boundary, one would use moles of A or B per unit area instead.)
  The exponents m and n are called partial orders of reaction and are not generally equal to the stoichiometric coefficients a and b. Instead they depend on the reaction mechanism and can be determined experimentally. 
  Sum of m and n, that is, (m + n) is called the overall order of reaction.