Knovel is a database of over 4,000 engineering handbooks and other reference books. It provides a great breadth of introductory information related to every engineering discipline. It also includes large amounts of data that can be downloaded and manipulated in many different ways. If you need to understand how a distillation column works, find the hardness of austentic stainless steel, or review the theory behind lift and drag on airplane wings, Knovel will help you find the answer!