What is Permeability: Definition and 126 Discussions

Permeability in fluid mechanics and the Earth sciences (commonly symbolized as k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it.
The permeability of a medium is related to the porosity, but also to the shapes of the pores in the medium and their level of connectedness. Fluid flows can be influenced in different lithological settings by brittle deformation of rocks in fault zones; the mechanisms by which this occurs are the subject of fault zone hydrogeology.

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  1. F

    H of a toroidal coil with relative permeability

    Consider a toroidal coil of rectangular section of N turns, for every one of which circulates a stream I. The inner radius of the coil is a and b is the exterior and the height is h. The core of this coil is a material inhomogeneous in such a way that their magnetic permeability just depends on...
  2. A

    Permittivity and permeability of ErAs, SI or any metamaterial

    hi..i'm an undergraduate student.i'm working on my final year project. I've been looking for the permittivity and permeability of ErAs, SI or any metamaterial but i find it difficult to get. i hope this forum could help me (n hope this forum is still active..hehe) THANX! o:)
  3. S

    Permeability with static and dynamic H fields

    If a material has a higher permeability (electromagnetism) than another when in the presence of a fixed H field, would it generally also have a higher permeability when in the presence of a changing H field?
  4. S

    Finding Absolute Permeability from Magnetization

    Homework Statement I am doing a project for which I am learning some aspects of electromagnetism by myself, so you can imagine how lost I am. Well, not completely: I was searching for a ferrite with high permeability as a core material. I learned how the octahedral and tetrahedral sites and the...
  5. I

    Why permeability equal to unity?

    I apologize if this is not in the correct section of the forum, but it seems most fitting. In the context of dielectric materials, I am having trouble understanding why in the discussion of the optical properties of magnetized bodies, it is justifiable to assume for light vibrations...
  6. S

    Relative Permeability of Lead: Can I Assume Value of 1?

    Simply, all I want to know is the value of the relative permeability of lead?? Can I assume this value to 1??
  7. S

    PH effects on membrane permeability

    I had this lab done where we took beets and tested the effects of pH on membrane permeability. We used different concentrations of HCl and NaOH. Why did I get such a strong colour intensity with a test tube that had 0.001 M NaOH? And how do I know this experiment affected the protein...
  8. H

    Negative Permeability Metamaterials: Explaining Stop Band Mechanism

    Metamaterial structures such as split ring resonators exist such that at their resonant frequency, a stop band occurs, and are effectively therefore opaque to electromagnetic radiation at those frequencies. Could anyone explain this mechanism?
  9. T

    Magnetic Permeability Explained (Layman Terms)

    I was wondering if someone could please explain to me, in layman's terms, what magnetic permeability and relative permeability entails. thankyou
  10. C

    Permeability of free space question

    Hi everyone, Been doing some reading on permeability lately... My question is would the permeability of free space (u0) be related in any way to the vacuum energy density or would it remain the same regardless (4PIx10-7)? For eg would u0 be lower inside the space between the Casimir plates...
  11. N

    Temperature dependancy of the magnetic permeability

    I just need see how the magnetic permeability of a piece of steel will change with a change in temperature. The reason why I need this is so that I can see what happens to the eddy current penetration depth when the material is being heat treated I already know that the electrical...
  12. C

    Permeability of various material to Radon gas

    Has anybody done testing on how well various materials can prevent the passage of Radon gas? For example, a container made of thin low density plastic will apparently gradually permeate out Radon, but a high density plastic container will not. Other materials I have in mind are rubber...
  13. M

    Effect of pH on beetroot cell membrane permeability

    im meant to design an experiment (at AS level) and perform it to see how the pH can affect beetroot cell membrane permeability. i don't know where to start. anyone have any experiments?? thanks :biggrin:
  14. S

    Magnetic permeability of water vapour

    Searched all over, still could not find the magnetic permability of water vapour. Please help!. email me at shellysharma@yahoo.com if you know the value. Thanks for your time!
  15. K

    Magnetic Permeability and Electric Permittivity effects on atomic clocks

    Speed of Light c= \frac {1} {\sqrt{\varepsilon_0\mu_0}} Phase Velocity v= \frac {1} {\sqrt{\varepsilon\mu}} Electric Permittivity of Free Space \varepsilon_0 = 10^{7}/4\pi c^2 \quad \mathrm{(in~ A^2\, s^4\, kg^{-1}\, m^{-3}, \, or \, F \, m^{-1})} Magnetic Permeability of Free Space...
  16. K

    Magnetic permeability and magnetic resistance

    hi from ukraine i'm a electronic engineering student at kiev polytechnic university i need your helps how can i calculate this question The steel winding with the number of coils w= 200 is put on thr ring-like closed core in regular intervals.The section is rectangular. The external...
  17. N

    Trying to simplify a permeability expression

    I'm just looking through some work I did a while back and trying to simplify an expression, epsilon_{0}epsilon_{r}=epsilon is there an expression for mu_{0}mu_{r}?
  18. H

    Permittivity and Permeability of Free Space

    Permittivity of a vacuum is a number arrived at beginning with a value for the speed of light in the vacuum and the permeability of the vacuum. NIST uses the term "electric constant" for what is commonly known as the permittivity of free space: Here's their official value...
  19. D

    Permitivity and Permeability: What's the Difference and When Do We Use Them?

    Hi i am trying to frigure out the similarities and differences between permitivity and permeability? When do we use the one or another term?
  20. Chronos

    Permeability and permittivity question

    I'm feeling a bit lazy, but curious. What experimental results confirm the values assigned for permeability and permittivity [as it relates to c]? I haven't explored the literature very thoroughly, but, have not been altogether satisfied with what little I found. Thanks!
  21. Artermis

    What Happens to Beet Root Pigments When Cells are Disrupted with Chloroform?

    Quote: Originally Posted by Artermis Hello Moonbear, I don't know if you know me but I'm a relatively new member but I know that you are very knowledgeable and helpful, hopefully you'll be willing to help me with this. Hi, I've seen you in the biology forum recently. Glad to have you...
  22. H_man

    Magnetic Dipole Moment does not include the permeability of free space?

    Magnetic Dipole Moment does not include the permeability of free space? Hi, The formula for a magnetic field in a current loop involves the permeability of free space. But the formula for the magnetic dipole moment which seems to represent the flux through a current loop does not...
  23. M

    Permeability of Light: Dependence Factors

    What does a substance's permeability of light depend on?
  24. M

    Permeability and Permittivity of Free space

    Does anyone know of a physical explanation of \epsilon_{0} and \mu_{0}?
  25. D

    Why does the permeability of free space have an exact value?

    And why is it related to pi?
  26. E

    What Are the Dimensions of Permeability and Permittivity?

    Could someone please tell me the most detailed and direct definition of permeability and permittivity. I know that they are porportionalities of some sort but what else could they be viewed as? Why is εμ = 1/c^2 ?
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