english: So this says that it's impossible, by definition, to measure exactly the state -- i.e., the position -- and the momentum of a particle, because the act of measuring it, by definition, changes it.
non_english: Ovaj princip nas uči da je po definiciji nemoguće potpuno tačno izmeriti stanje, npr. poziciju, i impuls čestice (proizvod brzine i mase), zato što sam čin merenja, po definiciji, menja česticu.