 The advancing and receding contact angles can be measured directly using different methods and can also be calculated from other wetting measurements such as force tensiometery (aka Wilhemy-Plate method).Advancing and receding contact angles can be measured directly from the same measurement if drops are moved linearly on a surface.For example, a drop of liquid will adopt a given contact angle when static, but when the surface is tilted the drop will initially deform so that the contact area between the drop and surface remains constant.