Classical limit --

From the perspective of the scientific method, any new theory must be able to explain the predictions of previous theories. We resolve the unpredictability described in quantum mechanics with the reliability of the physics which you learned and verified in lab in your previous classes through the concept of the classical limit. In quantum mechanics, it turns out that the prediction of traditional or classical physics is by far the most likely possibility with all of the weird things mentioned above having extremely low probabilities, unless the objects involved happen to be very ``small'' in a sense we will quantify in Section 3. This idea gets the name classical limit because it is usually phrased mathematically: in the limit as the size of things becomes large, the probability of the classical result approaches one (certainty).