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What justifies something being classical or quantum? According to the course reader, classical mechanics "explains the behavior of large objects" while quantum mechanics "describes the behavior of very small objects that can accept energy only in discrete amounts". What exactly makes an object "large" or "small" to fit classical or quantum mechanics respectively?
Classical mechanics seeks to explain the behavior of objects that are larger than molecules. These are objects that can be observed by the naked eye. Quantum mechanics seeks to explain objects at a molecular level, being described by elements from the Periodic Table. Once objects do not fit the parameters for classical mechanics it can later be described with quantum mechanics and vice versa. On page three of the course reader, a bucket of water can be described by classical mechanics because of is behavior and how it can be easily observed. However, water can also be classified by quantum mechanics because it is an H20 molecule.
I was under the impression that quantum mechanics specifically referred to the energy that can be transferred to or from a particle. Thus it would only deal with electrons and photons rather than large molecules. Is this not the case?
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