Classical physics

It has been suggested that this article be merged with Modern physics to Classical and modern physics. (Discuss) Proposed since February 2025.

Classical physics refers to physics theories that are non-quantum or both non-quantum and non-relativistic, depending on the context. In historical discussions, classical physics refers to pre-1900 physics, while modern physics refers to post-1900 physics, which incorporates elements of quantum mechanics and relativity.^[1] However, relativity is based on classical field theory rather than quantum field theory and is often categorized with "classical physics."^{[citation needed]}