Difference between quantum mechanics and classical mechanics

CLASSICAL MECHANICS vs QUANTUM MECHANICS

 Classical mechanics if we see carefully consist of physical view of object and it is very easy to understand no one can understand mechanics without going into classical field. Classical mechanics was the first one to describe the law of nature and then on the basics of classical field quantum field was was develop which some time i feel is that without it today's technology would not have been developed Thanks;D. If in simple language i would say is mechanics itself is a subject in which complete nature's descripton is given. Sir issac newton father of mechanics was the only one to describe gravity without which i think mechanics would be incompltete and yes still in quantum we have einstein the great , neil bohr, etc who developed it. Still there are thousands  of others whom you may google out.

Now coming to quantum field these subject is completely based on atoms and its sub atomic particles. These field is every important nowadays to develop the field of nanotechnology, the concept of light and variouis soace theory can only be explained by quantum mechanics. The rules of quantum mechanics are fundamental. They assert that the state space of a system is a Hilbert space and that observables of that system are Hermitian operators acting on that space—although they do not tell us which Hilbert space or which operators. These can be chosen appropriately in order to obtain a quantitative description of a quantum system. An important guide for making these choices is the correspondence principle, which states that the predictions of quantum mechanics reduce to those of classical mechanics when a system moves to higher energies or, equivalently, larger quantum numbers, i.e. whereas a single particle exhibits a degree of randomness, in systems incorporating millions of particles averaging takes over and, at the high energy limit, the statistical probability of random behaviour approaches zero. In other words, classical mechanics is simply a quantum mechanics of large systems. This "high energy" limit is known as the classical or correspondence limit. One can even start from an established classical model of a particular system, then attempt to guess the underlying quantum model that would give rise to the classical model in the correspondence limit.Quantum Physics goes a few steps beyond molecules and has taken these tiny little wonders, broken them down even further and developed the ability to study and better understand the various things that make them up. These are known as subatomic particles. When these subatomic particles are broken down and analyzed even further, quantum physicists have discovered that they are made up of additional sub-atomic particles that exist within sub-atomic particles.


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