And so because in this particular case we only have one exponent, that means the rate, the order is first. And in this particular case the order is also first. But if we for example move on to a second order reaction, let's suppose we have A and B are the two reactants and they react to produce C. And this k value is basically the reaction constant, the rate constant. Now if A is first order and B is also first order, then this will be our rate law. So the rate of the reaction v is equal to k, that rate constant multiplied by the concentration of A to the power of one and the concentration of B to the power of one. And the overall order of this reaction is one plus one.