To experimentally measure the viscosity of a liquid, a device such as that of figure, in which the liquid diameter duct wwwwww wwww wwww whose viscosity is to be determined is poured in the section A tank and is discharged through the D (D < < < A) and length LD.. The experimental measurement consists of determining the time to which How long does the liquid take to descend from a certain level h1 marked on the tank to another h2