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How Does the Viscosity of a Liquid Change with Temperature Theory Viscosity is a measure of a fluid's resistance to flow when acted upon by an external force such as a pressure differential or gravity. Viscosity is a general property of all fluids, which includes both liquids and gases. It describes the internal friction of a moving fluid. A fluid with large viscosity resists motion because its molecular makeup gives it a lot of internal friction. A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion. The viscosity affects the size of liquid particles, increasing the viscosity tends to increase the size of liquid particles, which then increases their gravitational settling rates. The viscosity of a liquid changes with temperature, as the temperature increases the viscosity decreases as the intermolecular forces weaken. Energy added to the system in the...

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