Question

what is meant by quantum physics ​

Answer 1

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Put simply, it's the physics that explains how everything works: the best description we have of the nature of the particles that make up matter and the forces with which they interact. Quantum physics underlies how atoms work, and so why chemistry and biology work as they do.

Answer 2

Quantum mechanics explains how the universe works at a scale smaller than atoms .It is also called quantum physics or quantum theory. Mechanics is the part of physics that explains how things move and quantum is the Latin word for 'how much' .