PERMITIVITY and PERMEABILITY MEASUREMENTS

I have exhausted my meagre ability to find some basic science information which is of great interest to me. I want to know where to internet to read MODERN experimental determinations of permitivity and permeability of space, under conditions of very high grade vacuum, and, if experiments have been done, away from the surface of the Earth in a satelite or the space station. Is anyone in these forums willing to tell me where to go?

Please Register or Log in to view the hidden image!

 

Log in or Sign up to hide all adverts.

I'd suggest searching these sites:
http://google.com/
http://en.wikipedia.org/
http://arxiv.org/
http://citeseer.ist.psu.edu/

 

Log in or Sign up to hide all adverts.

Alpha: thank you for your helpfulness.

Please Register or Log in to view the hidden image!

 

Log in or Sign up to hide all adverts.

I think you might be confusing the two words permitivity and permeability because they are similarly spelled? If not, you're pretty darn smart!

Permitivity, also referred to as the dielectric constant of an electric current (is a noncunductor of electric current that has to be measured in a vacuum to be absolutely accurate), refers to the ability of a material to store potential electric energy under the influence of an electric field and is basically measured by its capacitance (the storage of its electrc energy between opposite charges of different potential).

Permeability of space refers to the degree of magnetisation of a material in response to a magnetic field. Magnetic fields are produced by electric currents that exert a force on objects with a moving charge: electromagnetic fields.

These two concepts, as far as I know - which is not too far! - are only related together by Einstein's Theory of Special Relativity, and I have never heard of any experiments that relate the two "under conditions of very high grade vacuum." Further, there is no such thing as a high "grade" vacuum. You can have a low vacuum, a high vacuum, or an absolute vacuum; but when you start talking about "grades" within a vacuum, then that refers to the composition of the material that you are putting in the vaccum. For example, a low grade of steel or a high grade of steel. So I think you're combining mixed terminology here.

However, in Einstein's Theory of Special Relativity, electric and magnetic fields become two aspects of the same thing (two tensors), where one observer perceives a magnetic force while another moving observer perceives an electrostatic force. Therefore, by using Einstein's Special Theory of Relativity, magnetic forces are a manifestation of electrostatic forces of charges in motion and can be predicted from knowledge of the electrostatic forces and the relative movement of the charges.

But permitivity refers to the ability of a material to store potential electric energy, while permeability refers to the degree of magnetisation: the ability to store something, and the degree or amount of something, are two entirely different concepts, totally unrelated to Einstein's theory.

 

valich: I think you might be confusing Albert Einstein with James Clarke Maxwell and confusing Theory of Special Relativity with Maxwell's Equations. If not, your cleverness must have no limit.

In conjunction with writing his equations which relate electricty to magnetism, ( which are very well known among physicists ), Maxwell started with already known wave equations and, using then known measurements of permeability and permitivity of free space, or, vacuum, predicted that electromagnetic waves would travel with a speed which matched the already known velocity of light. Maxwell's equation for the velocity of light was: c=1/sqrt ( permitivity of space x permeability of space ).

"High grade vacuum" is an often-used phrase in professional science and engineeing, meaning a vacuum with relatively few remaining particles and therefore very low pressure.

The purpose of my curiosity about modern measurements of permitivity and of permeability of high grade vacuum, and, hopefully, measurements made away from the Earth, is to once and for all prove that any theoretical ether effect upon permitivity and permeability and therefore any effect upon c, due to "ether drag" or something like that, is definitively nonexistant.

The next time you crave to bluff your way through a post you might have better luck in a basket weaving thread.

Have a Relatively nice day.

Please Register or Log in to view the hidden image!

 

Thanks for the correction - and the update! I had know idea I was replying to someone on as a professional level as you are! The grammar kind,ve threw me off. Terribly sorry about that: you definitely are far beyond me. In my fields (biology, also formerly studied only one year of college physics), we don't refer to "grades" of vacuum.

I think you're referring to "relative permittivity," not permitivity? I thought relative permittivity in free space was derived by Maxwell's equations but weren't the two concepts as "related to each other in a vacuum in free space" only brought together by the The Special Theory of Relativity' i.e., the speed of light is only constant in a vacuum? That's as far as at least I thought that I knew?

 

Okay. Now I see where I was mistaken. It's been a long time since I studied physics. Had to review it. I am being sincere though ya know.

 

valich: I sincerely want to wish you the best of luck. Do you still have your old college physics textbook? Read it again sometime. All of it.

 

are you familiar with the Michelson-Morley experiement? I was under the impression that they quite difinitevly proved the non-existence of ether. Unless there were some further experiments (that I'm obviously unfamiliar with) that said otherwise....?

 

what do you want this info for???

what do you hope to do with it?

-MT