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When scientists measure a liquid's resistance to flow, they are not measuring the liquid's conductivity. Conductivity refers to a substance's ability to conduct electricity. This is different from a liquid's resistance to flow. They are also not measuring the liquid's solubility, which refers to a substance's ability to dissolve in another substance. This is again a different measurement from a liquid's resistance to flow. They are also not measuring the liquid's poisonous nature, as this refers to the toxic effects a liquid may have on living organisms. This is not related to a liquid's resistance to flow. The correct answer is B viscosity, which is the measure of a liquid's resistance to flow or its “thickness” or “stickiness.” This property is important in understanding how substances move and interact with other substances.