* Definition: Angular acceleration is the rate of change of angular velocity. Angular velocity is itself a pseudo vector.

* Pseudo Vector Properties:

* Direction: A pseudo vector's direction is determined by the right-hand rule. It's not a true direction in the sense of a vector, but rather a convention used to represent a rotational effect.

* Transformation: Under reflection, a pseudo vector changes sign, while a true vector remains unchanged.

* Example: Consider a spinning wheel. The angular acceleration of the wheel is directed along the axis of rotation. If you mirror the spinning wheel, the angular acceleration still points along the same axis, but its direction (determined by the right-hand rule) will flip.

In Summary: Angular acceleration is a pseudo vector because its direction depends on a convention (the right-hand rule) and it changes sign under a reflection.