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The other answer is very good, but more technical. Here's a simple explanation.

Interaction with something (anything) affects it to some amount in some way. Observation is a form of interaction, including determining specific attributes (position, movement/momentum, energy states, etc.)

Hence the interaction necessary to accurately determine the position of something affects other properties, including its movement. It's like trying to determine where a marble is rolling on the floor. The only way to be absolutely sure of its position is to stop it from moving (hence affecting its momentum).

Conversely, interaction to determine it's momentum/movement (using the marble again) requires following it so you can measure velocity/vector/etc -- like a motion picture camera following an object as it moves. But doing so requires you to ignore where it was at the time you started measuring it... hence leaving its position during the measurement uncertain.

2006-12-22 07:36:46 · answer #1 · answered by coragryph 7 · 1 1

The Heisenberg uncertainty principle or the Heisenberg indeterminacy principle states that when measuring conjugate quantities, which are pairs of observables of a single elementary particle, increasing the accuracy of the measurement of one quantity increases the uncertainty of the simultaneous measurement of the other quantity. The most familiar of these pairs is the position and momentum.

2006-12-22 14:53:25 · answer #2 · answered by azoocart 1 · 1 1

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