Is the Uncertainty Principle affected by the number of particles in a system?

In summary, the Heisenberg Uncertainty Principle states that it is impossible to know certain observable properties of a particle simultaneously, and this has been experimentally verified. It does not mean that particles do not exist when not observed, but rather that their properties are not well defined until measured. It is possible that this uncertainty disappears as the number of particles increases, but there is currently a disconnect between our understanding of the microscopic and macroscopic worlds.
  • #1
ArmenianG
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To my understanding Heisenberg Uncertainty Principle, states that we do not exist due to the fact that atoms("what we are made of") are not present, when they are not consciously observed. Please elaborate.
 
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  • #2
ArmenianG said:


To my understanding Heisenberg Uncertainty Principle, states that we do not exist due to the fact that atoms("what we are made of") are not present, when they are not consciously observed. Please elaborate.

Welcome to PhysicsForums, ArmenianG!

Your statement is not in accordance with the conventional reading of the HUP. The HUP says that you cannot know simultaneously, to unlimited precision, what is called non-commuting observable properties of a particle (or particles). An example would be knowing both the position and momentum of an electron precisely. This principle has been experimentally verified in thousands of experiments.

It does not say that *particles* do not exist when they are not observed. A closer reading would be that unmeasured particle properties are not well defined. This is a purely quantum phenomenon, as classical objects have such properties at all times independent of observation.
 
  • #3
ArmenianG said:


To my understanding Heisenberg Uncertainty Principle, states that we do not exist due to the fact that atoms("what we are made of") are not present, when they are not consciously observed. Please elaborate.

Just as a general rule, when you hear something about the macro world (outside of black holes) that seems nonsensical (such as your interpretation of the HUP) it's likely wrong.

At the MICRO level, lots of stuff is nonsensical --- but RIGHT.
 
  • #4
I don't see any reason to assume there is anything special about conscious observation as opposed to "observation" as just measurement by a measuring device. This came up in another thread. I don't like the word observation at all when used in this context because it has too much of a connotation with human observation, which, I think, has no privileged place in physical law. Human observation is just another physical process.

Even the word measurement is kind of misleading because it suggests someone set it up when, actually, nature sets up lots of "measurements" herself without any human involvement.

It's just that some physical processes have a different status in quantum mechanics than others--those that result in some macroscopic classical effect ("measurement"). This is a very artificial-looking division of physical processes, but it does predict the results of experiments.
 
  • #5
Thank you
 
  • #6
DrChinese said:
Welcome to PhysicsForums, ArmenianG!

Your statement is not in accordance with the conventional reading of the HUP. The HUP says that you cannot know simultaneously, to unlimited precision, what is called non-commuting observable properties of a particle (or particles). An example would be knowing both the position and momentum of an electron precisely. This principle has been experimentally verified in thousands of experiments.

It does not say that *particles* do not exist when they are not observed. A closer reading would be that unmeasured particle properties are not well defined. This is a purely quantum phenomenon, as classical objects have such properties at all times independent of observation.

Can it also be possible that Uncertainty gradually disappear as the collection of particles increases. It is possible when trillions of particles occupy a small space, number of certain 'still unknown constraints' go up which make HUP disappear.

In the back of my mind I 'feel' our knowledge (theories) has a serious 'disconnect' between microscopic and macroscopic worlds. The reason the other thread on 'QM's statistical interpretation' is going ballistic is no one knows how/when to cross the boundary of this 2 worlds.
 
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What is the Uncertainty Principle?

The Uncertainty Principle, also known as the Heisenberg Uncertainty Principle, is a fundamental concept in quantum mechanics that states it is impossible to simultaneously know the exact position and momentum of a particle. This principle was proposed by German physicist Werner Heisenberg in 1927 and has since been a cornerstone of modern physics.

How does the Uncertainty Principle relate to everyday life?

The Uncertainty Principle may seem abstract and unrelated to everyday life, but it actually has many practical applications. For example, it helps explain why we can't predict the exact path of a hurricane or the exact location of an electron in an atom. It also plays a role in the development of technologies such as MRI machines and computer hard drives.

Can the Uncertainty Principle be violated?

No, the Uncertainty Principle is a fundamental law of nature and cannot be violated. It is not a limitation of technology or measurement, but rather a fundamental property of the universe.

How does the Uncertainty Principle differ from the Observer Effect?

The Observer Effect refers to the fact that the act of measuring or observing a particle can affect its position or momentum. This is often confused with the Uncertainty Principle, which states that it is impossible to know both the position and momentum of a particle at the same time. The Observer Effect is a result of the Uncertainty Principle, but they are not the same concept.

Is the Uncertainty Principle a proven theory?

Yes, the Uncertainty Principle has been extensively tested and confirmed through experiments and observations. It has become a fundamental principle in modern physics and is widely accepted by the scientific community.

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