Question

: Scientific Reason :
A liquid is less viscous at high temperature.
(remember answer should be short)

Answer 1

It is due to the fact that at high temperature.... The kinetic energy of molecules of liquid increases which thus increases the movement of liquid reducing the intermolecular forces between the particles of liquid.... Hope tht helps..!!

Answer 2

The impact of increasing the temperature of a liquid is to reduce the cohesive forces while simultaneously increasing the rate of molecular interchange.
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.