 For all practical purposes, temperature can be treated as constant in the articulatory system.Thus, Boyle's Law can usefully be written
as the following two equations.What the above equations express is that given an initial pressure "P"1 and volume "V"1 at time 1 the product of these two values will be equal to the product of the pressure "P"2 and volume "V"2 at a later time 2.