Viscosity describes the flow behaviour of liquids. It is defined as the internal frictional resistance of a liquid to the application of a pressure or a shearing stress. The dynamic viscosity is normally given in millipascal-seconds (mpas) and is usually determined by using a  viscometer.

For further information on the viscosity of liquids:

http://www.buerkle.de/media/files/Downloads/Viscosity_EN_2012.pdf

For mopre information on C amlab Viscometers