This lesson starts the transition from two dimensions into three dimensions. Flux, curl, work, integrals, and all other topics are simply moved into space from the plane. Triple integrals in rectangular and cylindrical coordinates are explained in this lecture. It is very important that you have a firm understanding of how double integrals work in the plane before trying to tackle this lesson. Some very involved examples are shown using rectangular, polar, and cylindrical coordinates. This is a very interesting but possibly confusing lesson.