# How can one be 'certain' about anything that has an “Uncertainty Principle” at its core? [closed]

The Uncertainty Principle, which says that more than one aspect of a particle cannot be measured simultaneously, illustrates one of several major differences between quantum physics and classical physics. This idea, first presented by Heisenberg, takes into account that a miniscule bit of material can be either a particle or a wave, depending on the circumstance.

Actually, it is neither, until someone looks at it or an experiment forces it to pick sides. This means that a number of qualities aren't defined. If a scientist measures the speed of a particle, for instance, he can't measure position very accurately; it's as though quantifying one aspect puts the other aspects more out of focus. Physicists know this and try to compensate for it in their experiments. Still, the word "uncertainty" is there for a reason. Some physicists say this is not a principle at all and instead prefer to call the concept "uncertainty relations".

## closed as unclear what you're asking by Alfred Centauri, ACuriousMind♦, Carl Witthoft, Jim, Kyle KanosNov 20 '14 at 14:28

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• And your question is? – ACuriousMind Nov 20 '14 at 13:04
• My question is the title itself. – Sushant23 Nov 20 '14 at 13:09
• I don't understand the question. The uncertainty principle is not a vague statement like "We cannot be sure about anything", but a precise statement about the variances of non-commuting operators, of which we can be certain. – ACuriousMind Nov 20 '14 at 13:16
• See my answer here, the uncertainty principle is a precise consequence of Fourier decomposition, there is even a purely classical analogue of it. – Hypnosifl Nov 20 '14 at 13:21
• This is not a physics question: it's a philosophy question, and a rather uneducated one at that. – Carl Witthoft Nov 20 '14 at 13:29