A new approach and successful method of studying the turbomolecular vacuum pump. Gaede's equations and Becker's treatment lead to two equations k = f1(u0, s, g) and S = f2(u0, s, g), which connect the compression ratio k and the pumping speed S with the rotational speed u0, the tangent s of the blade's angle and the geometry g of such a pump. The design of a turbomolecular vacuum pump is then possible through its geometry and its losses.