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Fick's First Law of Diffusion deals with diffusive flux. The law postulates that flux goes from high to low areas of concentration with a magnitude that is proportionate to its spatial derivative.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoFick's first law is:
J = -D dΦ/dx
(note: I used "d" here instead of the partial differential sign because I couldn't find that in the available fonts)
where
- J is the "diffusion flux" [(amount of substance) per unit area per unit time], example [mol/(m2∙s)]. Jmeasures the amount of substance that will flow through a small area during a small time interval.
- D is the diffusion coefficient or diffusivity in dimensions of [length2/time], example (m2/s).
- Φ (for ideal mixtures) is the concentration in dimensions of [amount of substance per unit volume], example (mol/m3)
- x is the position [length], example m (meters)
Wiki User
∙ 14y agoJ = -DA (Delta)c/(Delta)x
Where
J=Net rate of diffusion (gms or mols/unit time)
D = diffision coefficient for the diffusing solute
A = area of the membrane
(Delta) c = concentration difference accross the membrane
(Delta) x = thickness of the membrane
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Who was the first to explain gravity in his law of gravitation?
Newton.
What is Fick's law?
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 / dR=the rate of diffusionD=diffusion coefficient, which is a characteristic of the medium and varies exponentially with temperatureA=the surface areaand dC/dx Is the concentration gradient over the diffusion distanceFick'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 diffusion2. 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)whereδ is being used as the symbol for partial differentialφ is the concentration in dimensions of [(amount of substance) length−3]t is time· is the "dot product"▼ is the del or gradient operatorD 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.
How does newtons first law explain keplors first law?
Newton's first and third laws of motion don't contribute anything to an understandingof Kepler's laws of planetary motion.Kepler's laws can be derived from Newton's law of universal gravitation, along with hissecond law of motion.
What type of flight can Newton's First Law best explain-explain your answer?
deep space, no air, no local gravity forces, no pushes or pulls, straight line flight at constant velocity first law points to unchanging state , whether at rest or moving
What gas law is gas leak?
grams law of diffusion deals with gases spreading out to occupy the shape of their container.
How does the second law of thermodynamic help to explain the diffusion of a substance across a membrane?
First, open up the Internet tab. THEN, go to Google. Last, type in your question and hit Enter. you are good to go after that! :)
Who was the first to explain gravity in his law of gravitation?
Newton.
What is Fick's law?
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 / dR=the rate of diffusionD=diffusion coefficient, which is a characteristic of the medium and varies exponentially with temperatureA=the surface areaand dC/dx Is the concentration gradient over the diffusion distanceFick'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 diffusion2. 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)whereδ is being used as the symbol for partial differentialφ is the concentration in dimensions of [(amount of substance) length−3]t is time· is the "dot product"▼ is the del or gradient operatorD 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.
Who Developed law of diffusion?
Graham!
What was the average diffusion rate of urea when the 200 MWCO membrane was used as a barrier?
Once diffusion occurs it does not matter the MWCO of the membrane, but it depends on difference of concentration, as it is said in Fick's first law.
What is grahams law of diffusion?
graham's law of diffusion states that the rates of which gases diffuse at the same temperature are inversely proportional to the square roots of their densities.
Diffusion at high temperatures?
According to Hook's Law: Rate of Diffusion is directly proportional to (Conc. Gradient x Temperature) / Diffusion distance
What is normatic diffusion in human resource management industries?
I think someone meant to say "nomadic" diffusion which is part of the Law of Diffusion and innovation in anthropology and geography.
Explain Isaac newtons first law of motion in your own words?
Push qnd
How do you explain the law of variable proportion?
Explain the Law of Variable Propotion
Can you explain what happens when you accelerate in car in terms of newton's first law?
No. The conditions for Newton's First Law are that there is no acceleration; and these conditions simply don't apply. You need Newton's Second Law for your analysis.
State the Graham's law?
graham's law of diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its density provided the temperature and pressure remain constant
