From Longman Dictionary of Contemporary Englishquantum mechanicsˌquantum meˈchanics noun [uncountable] HPthe scientific study of the way that atoms and smaller parts of things behave
Examples from the Corpus
quantum mechanics• Newtonian mechanics was eventually replaced by the theory of relativity and by quantum mechanics between 1905 and 1930.• Here, quantum mechanics provides us with a remarkable economy.• We are now able to understand why our information about the states of motion is so restricted in quantum mechanics.• It seems that the weight of the evidence is in favour of quantum mechanics and against local reality.• The whole point of quantum mechanics is that it has a different view of reality.• In fact, according to the rules of quantum mechanics, what is happening is even more mysterious than that!• We have learnt that, according to quantum mechanics, even a single particle must behave like a wave all by itself.• Physicists like the mathematical beauty of string theory because it banishes the absurdities that pop up when quantum mechanics and gravity combine. 