With the increase in temperature, the viscosity of a liquid decreases.
As the temperature of the liquid increases, the movement of its molecule increases, which disturbs the imbalanced forces on the liquid’s surface, thus, the barrier of tightly bound molecules weakens, thereby, Surface tension decreases.
With the increase in temperature, the surface tension of a liquid decreases.
As the temperature of liquid increases, the energy of its molecules increases, increasing the movement of molecules. So the liquid becomes more fluid, and thus viscosity of the liquid decreases.
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