Now, pressure also has an effect on rates and we'll see how in another video. Now we spoke about elementary reactions in which reactants become products in a single step. Now, there are also multi step reactions and those include many different steps, intermediate steps. However, we can use this guide or this formula to approximate our rates of multistep reactions as long as the concentrations of intermediates are held relatively low. Now that means suppose we have the following reaction a plus B react to form intermediate AB and then that intermediate AB reacts with C, some other guy to form ABC. Now this guy is out intermediate.