One of the easiest tests was already described above…the pour test. Without measurement and quantification, viscosity is relative. At a chocolate manufacturer, they consider vegetable oil to be a thin liquid. For customers handling mostly thin liquids like water, vegetable oil would be considered a viscous liquid. But if I were to step onto the court at a professional basketball game, you’d be more accurate to describe me as short. As an example, if you were to ask me if I’m tall, I’d say yes. The terms I used above are very subjective. The answer is yes to the full list above, but the key is knowing, beyond a general description of “viscous”, what the liquid’s viscosity actually is. Perhaps the most important distinction between solids and liquids (at least from our pump manufacturer point of view) is “can it be moved with a pump?”. But unlike solids the viscosities of these liquids can be measured and quantified. These liquids are so thick that they begin to blur the line between liquid and solid. These are all examples of very high viscosity liquids.
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