https://en.wikipedia.org/wiki/Classical_mechanics https://en.wikipedia.org/wiki/Classical_mechanics See the beginning and the Limits of Validity section. It's

https://en.wikipedia.org/wiki/Classical_mechanics https://en.wikipedia.org/wiki/Classical_mechanics See the beginning and the Limits of Validity section. It's "classical mechanics", "quantum", and "relativity". Thermaldynamics can overlap with quantum but there is a classical regime. Which, let's be clear https://en.wikipedia.org/wiki/Quantum_thermodynamics https://en.wikipedia.org/wiki/Quantum_thermodynamics