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Graham's Law of Diffusion

Graham's law of effusion (sometimes called Graham's law of diffusion) states that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles.

The ratio of molar flux species A to molar flux species B equals the square root of the ratio of the molecular weight species B to molecular weight species A.

Formula

QuantityVariable[Subscript["J", "A"], "MolarFlux"] == QuantityVariable[Subscript["J", "B"], "MolarFlux"]*Sqrt[QuantityVariable[Subscript["M", "B"], "MolarMass"]/QuantityVariable[Subscript["M", "A"], "MolarMass"]]

symbol description physical quantity
JA
molar flux species A
 "MolarFlux"
JB
molar flux species B
 "MolarFlux"
MA
molecular weight species A
 "MolarMass"
MB
molecular weight species B
 "MolarMass"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Graham's Law of Diffusion"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Graham's Law of Diffusion"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ ResourceObject["Graham's Law of Diffusion"], {QuantityVariable[ \!\(\*SubscriptBox[\("J"\), \("B"\)]\),"MolarFlux"] -> Quantity[0.224`, ("Moles")/(("Meters")^2 "Seconds")]}]
Out[3]=

Source Metadata

  • Creator:
  • Date: 1848

Publisher Information