Here's why:

* Gas Viscosity: Viscosity is a measure of a fluid's resistance to flow. In gases, viscosity arises from the collisions of gas molecules.

* Temperature and Molecular Motion: As temperature increases, gas molecules move faster and collide more frequently. This increased molecular motion means:

* Shorter Mean Free Path: The average distance a molecule travels between collisions decreases.

* Weaker Intermolecular Forces: The increased kinetic energy of the molecules weakens the weak attractive forces between them.

These combined effects lead to:

* Reduced Momentum Transfer: The faster molecules transfer momentum less effectively during collisions, leading to a lower viscosity.

In summary: Higher temperatures mean faster gas molecules, more frequent collisions, and weaker intermolecular forces, resulting in a decrease in gas viscosity.