Molecules atoms etc.

[RussianRocket]

I'm not sure when i heard abou this. I was trying to look this up on the net but couldn't find any good links. I've heard that some molecules can act by themselves without any external "push". Anybody that can clear this up woult be greatly apreciated.

[Saint Patrick]

[Reinier]

act by themselves? could you be a bit more specific?

[PowerManDL]

What he said.....I need you to narrow that down a bit before I can begin to comment.

[RussianRocket]

forming together, acting without reason. Something along those lines

[Reinier]

doesn`t make sense.

[GonePostal]

Diffusion?

[body]

everything has a reason, we just do not know what the reason is.

kind of like women.

[Praetorian]

deep man.

i dont think that molecules can just *act* by themselves without any external factors playing a role. Its not like they go *puff* and some **** happen. You need external factors.

[the doc]

there is always a thermodynamic or entropic reason to explain the behaviour of molecules

they never just act

[kook]

Originally posted by the doc
there is always a thermodynamic or entropic reason to explain the behaviour of molecules

they never just act

very true, but if it were true, we would have the "perpetual motion machine" man has been trying to make for many years, but by the laws of physics not possible

[Alex.V]

Originally posted by kook


very true, but if it were true, we would have the "perpetual motion machine" man has been trying to make for many years, but by the laws of physics not possible

No, because said machine would require external force to coordinate said motion. Which requires energy.

[kook]

Originally posted by Belial


No, because said machine would require external force to coordinate said motion. Which requires energy.

hmm.. thats what i meant to put across, if there were no external forces making something happen, we have a perpetual motion machine, but its impossible
i'm pretty sure we're on the same page, just some miscommunications
the socalled definition of a perpetual motion machine is one that once started with an external force will never need another external ever again


in this case someone said they heard atoms/molecules could act without an external force

[WestyHeadbanger]

These molecules are they just gravitating towards each other? If so that is within the known realms of physics.

[Podium Kreatin]

don't electrons ahve an intrinsic nature of repelling each others? there are a mix of attractions and repulsions between atoms all the time w/o added energy, and kinetic energy as long as T>0Kelvin (even at 0K, some say kinetic energy exists).

WestyHeadbanger, gravitational force is immeasurable til u get to the gigantic masses, such as planets, and even that, earth's gravity is considered very weak. atoms dont' have significant gravity, b/c if they did everything'll be clumped together, which defies entropy

[GonePostal]

Basic columbs law. There is energy involved. It takes energy to move those 2 charges into proximity. From a reference point say infinity to point a.

[Chomsky]

Originally posted by Podium Kreatin
don't electrons ahve an intrinsic nature of repelling each others? there are a mix of attractions and repulsions between atoms all the time w/o added energy, and kinetic energy as long as T>0Kelvin (even at 0K, some say kinetic energy exists).

WestyHeadbanger, gravitational force is immeasurable til u get to the gigantic masses, such as planets, and even that, earth's gravity is considered very weak. atoms dont' have significant gravity, b/c if they did everything'll be clumped together, which defies entropy

Electrons don't repel each other intrinsically.
What you are thinking of is how they act in an ionic compound, called electronegativity. Electronegativity determines how the atoms are shared inside said compound... For example, francium and flourine react to make francium flouride (FrF). Francium has an electronegativity of 0.7, and fluorine is 4.0. The atoms are unequally shared. Fluorine gets all the electrons and francium gets none!
That's the only occasion I can think of where electrons are attracted differently, because they are all negative charged!

[Chomsky]

As for the topic of this thread, I am not a physicist, but I can shed some light.
No.
Not possible, according to our current view of how the world works. It would violate the laws of thermodynamics. You can't have an action without a catalyst.

[GonePostal]

Chompsky there are things called point charges. Opposite charges attract like charges repel. This is the basics of any Electricity and Magnitism course. You have it confused with ionic compounds which are derivatives of E & M. Electrons in essence are point charges since their mass is so small.

1st law (or 2nd or 3rd can't remember) says you can't destroy or create energy. What was proposed tries to break this rule. As far as I know there is nothing that breaks this law.

[Chomsky]

oh, of course. i'm ****ing stupid. i took that stuff last year.
He says that a molecule that moves itself without any outside force acting on it exists.
That's creating energy, not changing it from different forms.

[GonePostal]

hehe too much chem for you!

[WestyHeadbanger]

Originally posted by Podium Kreatin

WestyHeadbanger, gravitational force is immeasurable til u get to the gigantic masses, such as planets, and even that, earth's gravity is considered very weak. atoms dont' have significant gravity, b/c if they did everything'll be clumped together, which defies entropy

Excuse me.

I think this is what you are after RussianRocket, PodiumKreatin be careful with making absolute statements, they have a 99.9% probability to be proven incorrect in the near or distant future:

[73.20] Density Interface Instabilities in Molecular Clouds; Self-Gravity Driven vs Rayleigh-Taylor
R.M. Hueckstaedt (Los Alamos National Laboratory, Applied Physics Division)

The structure and evolution of molecular clouds are affected by a large number of physical processes, including self gravity . In recent years, studies have shown that an interface of discontinuous density is unstable to perturbations due to the action of self gravity . Crenulations along the interface grow as the system seeks a lower energy state. Theory predicts a growth rate of the order of the free-fall time in the denser medium, even when the perturbation wavelength is less than the Jeans length. In the incompressible limit, the growth rate is independent from the perturbation wavelength. An ongoing computational study of the self-gravity driven interfacial instability (SGI) seeks to validate the linear theory and examine the nonlinear behavior. Preliminary results have shown growth rates in agreement with theory. Here, I present the latest results from hydrodynamic simulations using an expanded parameter space to further explore the behavior of the SGI. Comparison is made with the well studied Rayleigh-Taylor instability.

[PowerManDL]

Ah, that.

I figured that's where this was heading.......chaos theory is a bit beyond my scope to elaborate on at this point, though.....

Suffice it to say, given enough randomness you eventually find order.

[WestyHeadbanger]

[Podium Kreatin]

Originally posted by Chomsky

Electrons don't repel each other intrinsically.

electrons do have repulsion w/o extra energy (maybe intrinsic was teh wrong word). that's where normal force comes from (when you are standing on the ground, your atoms never touch the 'floor' atoms, the electron repulsion pushes u up so u don't fall straight down to the bottom of the earth.)

Originally posted by Chomsky

He says that a molecule that moves itself without any outside force acting on it exists.
That's creating energy, not changing it from different forms.

this does happen. even absolute zero (T=0K) some elements are still in liquid or gas phase, so therefore, there has to be movement even w/o energy (b/c fluid/solid phase is based on movement of atoms at certain conditions). soem say that there's no such thing as absolute zero. in both cases, they both say there is always gonna be some energy that always exist