![how to measure viscosity how to measure viscosity](https://wiki.anton-paar.com/fileadmin/wiki/images/How_to_Measure_Viscosity/figure02_types-of-glass-capillaries.png)
The rolling and sliding movement of the ball through the sample liquid are at times in an inclined cylindrical measuring tube. Moreover, six balls were used with different diameters for various dynamic viscosity measurement ranges, and a suitable ball can be selected when the fall times of the ball are not lower than the minimum fall times recorded during a testing procedure. The standards describe an inclined-tube method in which the tube for the falling ball was inclined at 10° to the vertical. 4,5 In the international standards, the method differs from the principle described in Refs. The falling ball viscometer is well-suited for measuring the viscosity of a fluid, and the method has been stated in international standards. The drag force can be obtained from Stokes’ law, which is valid in Reynolds numbers less than 1. In Newton’s law of motion for a falling ball, there exist buoyancy force, weight force, and drag force, and these three forces reach a net force of zero. The method applies Newton’s law of motion under force balance on a falling sphere ball when it reaches a terminal velocity. The falling ball viscometer typically measures the viscosity of Newtonian liquids and gases. These phenomena utilize three major viscometers in the industry, i.e., a rotating viscometer, a falling-ball viscometer, and a capillary viscometer. These are typically based on one of three phenomena-a moving surface in contact with a fluid, an object moving through a fluid, and fluid flowing through a resistive component. A number of methods are used to measure the viscosity of fluids.