FIELD: physics.
SUBSTANCE: method of determining viscosity of non-Newtonian liquids, involving their pumping through a channel, calculating flow per second and stream average velocity based on measured data, characterised by that viscosity of non-Newtonian liquids is determined using the expression 
where: ηw is the viscosity of water (Newtonian liquid), Pa·s; ηs is viscosity of a suspension (non-Newtonian liquid), Pa·s; 
is the stream average velocity of water (Newtonian liquid), based on measurements, m·s-1; 
is the stream average velocity of the water suspension (non-Newtonian liquid), based on measurements m·s-1. Viscosity of water (Newtonian liquid) is used based on reference data.
EFFECT: simple method of determining viscosity by using input data in form of widely known rheological parameters of water, which is the basic component of analysed suspensions.
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