A constant temperature, a #12*L# volume of gas in a piston, is compressed to #3*L#. If the original pressure was #41*kPa#, what is the final pressure?
Well, we use old Boyle's law.........and get
At constant temperature, and constant amount of gas, the product
And thus, if we solve for
The utility of this equation is that we can use whatever whack units of volume and pressure we like,