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Energy- what i dont get about the classical definition of energy is that it states "

**In classical physics energy is considered a scalar quantity, the canonical conjugate to time**." I get that it is considered to be a scalar quantity, but what the heck is a canonical conjugate? I searched everywhere and can't find the definition. I know that it shares a special relationship to time, but dont know what sort of relationship that is. Any help would be very much appreciated. (also, if anyone can give me more info as to why Quantum physics is better than Classical Physics that would be much appreciated also)