Question

what is composite system ?​

Answer 1

Answer:

In physics given two physical system their composite is meant to be both systems regarded as a single system, but trivially so, without the two interacting.

In classical mechanics forming a composite in this sense amounts to taking the cartesian product of their phase spaces.

In quantum mechanics forming the composite amounts to taking the (non-cartesian) tensor product of the spaces of quantum states.

Answer 2

Answer:

Composite is something made up of complicated parts. Composite means systems regarded as a single system.