Tough viscosity is driven under the factors such as temperature, molecular structure, shear rate, ambient conditions, and even flow conditions, it isn’t, partially, related to weight. The existence of matter consists on molecular structure which has a specific weight and also bond to create bulky structure. To examine detailed description on viscosity, you had better to check my previous article on it: Viscosity Amount of matter has no any effect of viscosity that the viscosity of a cup of water and a ton of water is same. Besides, I also wonder about comparison among substances in which the viscosity and density change in accordance with matter. Here is a compatible graph that compare several substance (I got the values from engineering tool box): Here is a video that compare biodiesel, glycerin, and vegetable oil: The viscosity only needed to weight for the purpose of existence, not much. Whole description is convenient for Newtonian fluids.
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