Question

explain effect of temperature on viscosity of fluid​

Answer 1

The former effect causes a decrease in the shear stress while the latter causes it to increase. The result is that liquids show a reduction in viscosity with increasing temperature. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

Answer 2

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. The gas viscosity will increase with temperature. ... With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same.

Viscosity is generally defined to be the internal resistance of a fluid when a shear force is being acted upon it.” It is such an internal resistance that doesn’t allow its adjacent molecules ( consider for a vertical string ) to go ahead of its present state.

In liquids the source for Viscosity is considered to be atomic bonding. As we understand that, with the increase of temperature the bonds break and make the molecule free to move. So, we can conclude that the viscosity decreases as the temperature increases. ( as the molecule is no more interrupted by its neighbor)

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