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Classical physics
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<p>Classical physics refers to <a href="/facts/Physics/a7aH2y08">physics</a> theories that are non-quantum or both non-quantum and non-relativistic, depending on the context. In historical discussions, <i>classical physics</i> refers to pre-1900 physics, while <i><a href="/facts/Modern_physics/J9Kko1qU">modern physics</a></i> refers to post-1900 physics, which incorporates elements of <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a> and the <a href="/facts/Theory_of_relativity/qGHj3eTC">theory of relativity</a>. However, relativity is based on <a href="/facts/Classical_field_theory/7HuKY1qu">classical field theory</a> rather than <a href="/facts/Quantum_field_theory/VoewsNJV">quantum field theory</a>, and is often categorized as a part of "classical physics". </p>