answersLogoWhite

0

Ficks laws (note that there are two of them) are:

Most people are concerned with Fick's first law which relates the diffusive flux to the concentration under the assumption of steady state:

R=D X A Dp / d

R=the rate of diffusion

D=diffusion coefficient, which is a characteristic of the medium and varies exponentially with temperature

A=the surface area

and dC/dx Is the concentration gradient over the diffusion distance

Fick's first law suggests that the rate of diffusion in a given direction across and exchange surface:

1. is directly proportional to the concentration gradient- the steeper the concentration gradient, the faster the rate of diffusion

2. is directly proportional to the surface area- the greater the surface area of a membrane through which diffusion is taking place, the faster the rate of diffusion this is one of the factors which limits cellsize.

3. is inversely proportional to the distance- the rate of diffusion decreases rapidly with distance. diffusion is thus effective only over short distances. this limits cell size.

Fick's second law predicts how diffusion causes the concentration to change with time. It is a partial differential equation which, within the character limitations of Wikianswers, the second law is:

δφ/δt = ▼·(D▼φ)

where

  • δ is being used as the symbol for partial differential
  • φ is the concentration in dimensions of [(amount of substance) length−3]
  • t is time
  • · is the "dot product"
  • ▼ is the del or gradient operator
  • D is is the diffusion coefficient in dimensions of [length2 time−1]

Note that when φ is at steady state, this equation reduces to Fick's first law.

User Avatar

Wiki User

13y ago

What else can I help you with?

Related Questions

What has the author Lucien Ficks written?

Lucien Ficks has written: 'V efire \\' -- subject(s): Biography, Civilization, History, Journalists, Voice of America (Organization)


Why do people misspell on questions and answers?

They are testing your level of volunteerism: To ficks or not to ficks, that is the questyun.It is ALWAYS preferable to fix the spelling and grammar in a question before answering. You may find that the answer already exists for the proper spelling. If the questions are later corrected and merged, your answer may be erased or misattributed to another user.


What is the name of a condition in which the brain does not receive oxygen?

Hypoxia is a condition where the brain does not receive enough oxygen. It can lead to symptoms such as confusion, dizziness, and in severe cases, loss of consciousness, brain damage, or death. Prompt medical attention is necessary to address hypoxia and prevent complications.


Why won't your woozworld won't load up?

it may happend that woozworld has technical problems or the website is broken so they try to ficks it. but dont worry me too it doesnt load somethimes


What actors and actresses appeared in O Remorso Vivo - 1909?

The cast of O Remorso Vivo - 1909 includes: Romeu Bastos Olga Benvinda Elvira Costa Joaquim de Oliveira Antonieta de Oliveira Regina Ferreira Isabel Ficks Eduardo Leite Joaquim Oliveria Franklin Rocha Anibal Rocha Samuel Rosalvos


What actors and actresses appeared in The Tree Ghost - 1996?

The cast of Goosehill Gang and the Mystery of the Treehouse Ghost - 1980 includes: Allison Balson as Beth Tracye Richardson as Melissa Bobby Rolofson as Don Danny Stern as Michael David Yanez as Pete


In alphabetical order which comes first law or lawn?

law because lawn has 4 letters and law has 3


What are the sources of law in America?

common law; ( case law) statutory law Administrative law court rules constitutional law


What are the rules of law?

This is too general of a question because law is too specialized of a course. There is criminal law, civil law, probate law, corporate law, patent law, family law, contract law and the list goes on and on.


What is a fundamental law what is a fundamental law?

a fundamental law is but constitutional law


What is the duration of The Law Is the Law?

The duration of The Law Is the Law is 1.58 hours.


Is it diploma in law or diploma of law?

diploma in law