Explain the origin of viscosity in air and account for the effect of temperature on it.

In air, molecules are further apart and have negligible intermolecular forces. Therefore the molecules move randomly colliding with one another and continuously transferring momentum to the neighbouring layers. The transfer of momentum constitute viscosity of air. When the temperature increases the molecules move faster, their kinetic energy increases and make more frequent collision. This increases the transfer of momentum and lead to increase in viscosity.

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