In the realm of classical mechanics, which describes the motion of macroscopic objects, the predictions and experimental results are generally well-explained by the principles of classical physics. However, when it comes to microscopic particles, such as atoms, molecules, and subatomic particles, the behavior of these systems is better described by quantum mechanics.
Quantum mechanics provides a more accurate and comprehensive framework to understand the behavior of particles at the quantum scale. It introduces concepts such as wave-particle duality, quantized energy levels, and probabilistic interpretations of physical properties.
That being said, in the macroscopic world, classical mechanics is a highly effective and reliable theory for explaining and predicting the behavior of objects. Classical mechanics successfully describes the motion of everyday objects, celestial bodies, fluid dynamics, and many other phenomena encountered in our daily lives.
However, there are some phenomena that are inherently quantum mechanical and cannot be explained by classical mechanics. Examples include the wave-like behavior of particles, quantum tunneling, quantum entanglement, and the behavior of particles in superposition states. These phenomena have been experimentally verified and observed in various quantum systems.
So, while classical mechanics is an excellent approximation for large-scale objects, it fails to fully explain and predict the behavior of systems at the quantum level. Quantum mechanics is necessary to accurately describe and understand the behavior of microscopic particles and their interactions.