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Does an object exist if no one observes it?

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Park Road Flag 04 Jan 18 8.30am

Interesting thread! Science never has all the answers but it continues to look for them.
Whereas religion, already has the answers so, no more need for investigation.

Personally, thinking for yourself as opposed a deity can bring you truth, more happiness and wisdom.

 

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Park Road Flag 04 Jan 18 9.15am

Does your fist exist?

Make a fist. Look at it; surely there’s a fist in front of you. Now open your hand. The fist is gone. What happened? The particles are the exact same, but their arrangement slightly changed. At some point between open and closed, your fist disappeared.

Or, “it” was never there to begin with.

This brings up another crucial problem. Let’s assume that you’re trying to argue the following is true: objects take up space. We also know:

a ) that object is made up of particles, and
b ) those particles also take up space.

So the question is this: does an object occupy the exact same space as the particles which make it up?

Either way you answer – yes or no – creates difficult problems.

Let’s say the answer is yes: objects occupy the exact same space as the particles which constitute them. This implies that every object has an exact number of particles. When that number changes, the object changes. When your chair gets a scratch, it would no longer remain the same chair, as it lost some constituent particles. It would become a chair-with-a-scratch. Even if you gently rubbed the chair, microscopic particles would be removed, and its metaphysical existence would change again. That means a practically infinite number of objects exist, and they are constantly popping in and out of existence with the slightest breeze. In fact, no concrete “object” would ever exist for more than an instant, as atoms are constantly bumping into each other. This scenario is logically possible, but it strikes me as utterly absurd and unnecessary.

So then we’re left with the answer being no: objects do not occupy the exact same space as the particles which constitute them. But this might even be more peculiar. What would a chair occupy space with, if not particles? Pure chair-ness? Concrete space, not filled by particles, but filled with some kind of non-particle-spatial-stuff. I can’t even imagine what that stuff would be.

This would also imply that the particles are unnecessary, and we could remove them without changing the chair at all. Take a chair, remove the physical particles, and you’re still left with a chair. But this is preposterous! I am unwilling to posit the existence of ghost-chairs. Surely, if we throw the chair into a fire and let it burn to ashes, it doesn’t remain a chair any longer, and it doesn’t take up space.

The only resolution is to say that objects do not take up space – they are not physical.

 

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View Stirlingsays's Profile Stirlingsays Flag 04 Jan 18 9.27am Send a Private Message to Stirlingsays Holmesdale Online Elite Member Add Stirlingsays as a friend

Make a fist.

Punch yourself in the face.

You have evidence that objects take up space.

Objects are constantly gaining and losing atoms as their properties change.

 


'Who are you and how did you get in here? I'm a locksmith. And, I'm a locksmith.' (Leslie Nielsen)

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View Hrolf The Ganger's Profile Hrolf The Ganger Flag 04 Jan 18 9.33am Send a Private Message to Hrolf The Ganger Add Hrolf The Ganger as a friend

Originally posted by davenotamonkey

Gargh! Are you kidding? Do you know how much modern technology is underpinned by quantum mechanics?!

Parallel universes are entirely hypothetical. Our understanding of the universe and the fundamental physics of matter in no way rely on them.

No. Are you seriously telling me that you understand quantum physics?
You better call someone.

 

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View davenotamonkey's Profile davenotamonkey Flag 04 Jan 18 10.31am Send a Private Message to davenotamonkey Add davenotamonkey as a friend

Originally posted by Hrolf The Ganger

No. Are you seriously telling me that you understand quantum physics?
You better call someone.

About as much as anyone else with a first-class honours degree in Physics, I guess.

Ok, I'll call my first University's registrar and get them to expunge the 86% score on my Quantum Mechanics final exam, because "some guy on the internet".

 

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View davenotamonkey's Profile davenotamonkey Flag 04 Jan 18 10.50am Send a Private Message to davenotamonkey Add davenotamonkey as a friend

Originally posted by Stirlingsays

Make a fist.

Punch yourself in the face.

You have evidence that objects take up space.

Objects are constantly gaining and losing atoms as their properties change.

1. That is not evidence "objects take up space" - most of matter is empty space, as deduced by the Rutherford experiment. This is actually evidence for the electromagnetic force.

2. In the most general case, when objects change state, their various energy levels change. At the quantum level, these changes are discrete (ie, in "chunks" or steps) and encompass thugs like spin and angular momentum. In the classical (ie. macroscopic) regime, most properties are on a continuous spectrum - liquid water molecules can have a wide range of kinetic energies. "Object" is somewhat loosely-defined, but water certainly doesn't change property through loss/gain of atoms. If water somehow "lost" an atom, it would simply cease to be called water. At the chemical level, pretty much all the properties of water relate to how the electrons behave.

 

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View Eustace H. Plimsoll's Profile Eustace H. Plimsoll Flag Aldershot 04 Jan 18 12.13pm Send a Private Message to Eustace H. Plimsoll Add Eustace H. Plimsoll as a friend

Originally posted by davenotamonkey

I'm not really sure how to answer this question, as I'm not sure why you intrinsically connect the notion of a wavefunction to how many dimensions you express it in.

The aforementioned 3D description of the Hydrogen atom is typically written in spherical polar coordinates (r, theta, phi). You could reduce this problem down to 2 dimensions, also in spherical coordinates (r, theta). When you "observe" the quantum state of the atom, you do so in the coordinate space you described the wavefunction in. If you have a 2D entity (like a disk), and embed this into a 3D space, you can still solve the wavefunction. But the 2D wavefunction does in no way imply the existence of the 3D space.

The "point" is the entire nature of fundamental science, and pretty much the nature of our reality, and indeed our very existence relies on it. Until observed, this Hydrogen atom exists in a superposition of states, separated and distinguished by quantised levels. Applying an "operator" to the eigenvectors (the "collection" of these states) yields an eigenvalue - this is the observation. A very common one is the Hamiltonian operator - this yields the energy (the eigenvector) of the system. At the fundamental level, this is the process by which all physical phenomena occur.

If you don't think there's any point of knowing the probabilistic location of particles in 3D space, I'd suggest you shut down your computer: those high-density circuits require consideration of quantum tunnelling of electrons through insulating layers.

You might also consider that our Sun relies on quantum tunneling for stellar fusion - the source of energy that permits our existence. We now understand, through calculating the quantum mechanical tunneling probability of a proton through the repulsive electromagnetic field, how two protons fuse to form deuterium (and in the process releasing energy).

I don't dispute there might well be extra dimensions: in science, a hypothesis must be falsifiable. Part of the problem with string theory is the lack of observables in experiments that could start discriminating between the "standard" model and those requiring extra dimensions.

If you were interested, the maths QM is built on is quite a mixed bag. Differential equations, calculus, vector calculus, matrix methods, complex numbers (essential for wave-based physics), coordinate transformation. Probably a tonne more stuff I've missed out :-)

My cat's breath smells of cat food.

Is davenotamonkey our cleverest poster? (Does Schrödinger’s Cat s*** in chateauferret's shower?) JamieMartin90210 must be spinning in his gravy.

Reminds me of when you'd get home pissed and then wake up in front of the telly at 2am with Open University yelling at you - telling you how stupid and pissed you are in future-speak - continuing the general state of discombobulation. Sounds like they're speaking English but couldn't swear to it. I recognise most of the words but the order seems mangled.

Genuinely seems fascinating and I really do try desperately clinging on for a few concepts, but then my brain's grip fails and I fall away. Still, the music and colours are nice.

Maybe it's all just code and an elaborate joke so they can laugh at us simpletons.

 


As a woman, I can step aside, or step up my game...

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View Hrolf The Ganger's Profile Hrolf The Ganger Flag 04 Jan 18 12.56pm Send a Private Message to Hrolf The Ganger Add Hrolf The Ganger as a friend

Originally posted by davenotamonkey

About as much as anyone else with a first-class honours degree in Physics, I guess.

Ok, I'll call my first University's registrar and get them to expunge the 86% score on my Quantum Mechanics final exam, because "some guy on the internet".

You said it.

How much of the big picture do you think that is exactly?

 

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View Stirlingsays's Profile Stirlingsays Flag 04 Jan 18 1.16pm Send a Private Message to Stirlingsays Holmesdale Online Elite Member Add Stirlingsays as a friend

Originally posted by davenotamonkey

1. That is not evidence "objects take up space" - most of matter is empty space, as deduced by the Rutherford experiment. This is actually evidence for the electromagnetic force.

Oh come now...... You know the electromagnetic force is there as a result of the atom's constituent charged particles. Also, I wouldn't call it 'empty space' personally as we are talking energy.

Originally posted by davenotamonkey

2. In the most general case, when objects change state, their various energy levels change. At the quantum level, these changes are discrete (ie, in "chunks" or steps) and encompass thugs like spin and angular momentum. In the classical (ie. macroscopic) regime, most properties are on a continuous spectrum - liquid water molecules can have a wide range of kinetic energies. "Object" is somewhat loosely-defined, but water certainly doesn't change property through loss/gain of atoms. If water somehow "lost" an atom, it would simply cease to be called water. At the chemical level, pretty much all the properties of water relate to how the electrons behave.

The property it loses is mass. You aren't seriously suggesting that if I rub a balloon against a woolly jumper that there isn't a transference of particles? Or that if I scratch or chip a chair that it doens't lose atoms.

These objects are still balloons or chairs. They only cease to be once they can't perform their functions.

 


'Who are you and how did you get in here? I'm a locksmith. And, I'm a locksmith.' (Leslie Nielsen)

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Park Road Flag 04 Jan 18 1.50pm

Originally posted by Stirlingsays

Make a fist.

Punch yourself in the face.

You have evidence that objects take up space.

Objects are constantly gaining and losing atoms as their properties change.


Sometimes I want to go back in time and punch myself in the face.

But someone tomorrow told me that time travel would involve special relativity, which might or might not be relative to this thread.


 

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View Stirlingsays's Profile Stirlingsays Flag 04 Jan 18 2.10pm Send a Private Message to Stirlingsays Holmesdale Online Elite Member Add Stirlingsays as a friend

Originally posted by Park Road


Sometimes I want to go back in time and punch myself in the face.

But someone tomorrow told me that time travel would involve special relativity, which might or might not be relative to this thread.


Ask them for the lottery numbers next time.

 


'Who are you and how did you get in here? I'm a locksmith. And, I'm a locksmith.' (Leslie Nielsen)

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jamiemartin721 Flag Reading 04 Jan 18 3.23pm

Isn't Schrodinger's cat a failed attempt to disprove quantum theory that's disproven by the Copenhagen interpretation.

And better explained by the Uncertainity Principle, that the problem of measuring anything on a quantum scale is that what ever you use to detect the particle, will have to interact with the particle (hence you can either know where it is, or how fast its going, but never both - not because of the act of observation, but that observation on a quantum scale requires that you cause a reaction - i.e. in order to measure a quantum particle, you have to 'hit it' with another particle to 'observe it' (its not like measurement on a relative scale). Any attempt to measure something so fundamentally small, will alter its state. Where as you can place a tape measure on a brick with no worry.

Economies of scale in variables or something like that.

 


"One Nation Under God, has turned into One Nation Under the Influence of One Drug"
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