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Fluidity refers to the ability or tendency of substances (liquids and gases) to flow easily due to their particles being able to move past each other freely.
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Viscosity: A measure of a fluid's resistance to flow. It describes the internal friction of a moving fluid.
Surface Tension: The property allowing liquid to resist an external force due to the cohesive nature of its molecules.
Capillarity: The ability of a liquid to flow in narrow spaces without the assistance of, and in opposition to, external forces like gravity.