plz help is molecule of gas diffuse faster than liquid?why?

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darkm
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plz help is molecule of gas diffuse faster than liquid?why?

Post by darkm » Wed Nov 09, 2005 3:01 am

plz help is molecule of gas diffuse faster than liquid?why?

thecow135
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Post by thecow135 » Wed Nov 09, 2005 3:29 am

this is a easy concept to grasp once u get it

molecules of gas diffuse faster than liquids, because in order to diffuse they have to mix.

gas particles move faster than liquid molecules, becuase they contain more energy.

this makes it much easier for gas molecules to diffuse.

also, gas moleclues are smaller particles, this makes it easier to mix more evenly.

hope this helps u
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darkm
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Post by darkm » Wed Nov 09, 2005 4:02 am

thecow135 wrote:this is a easy concept to grasp once u get it

molecules of gas diffuse faster than liquids, because in order to diffuse they have to mix.

gas particles move faster than liquid molecules, becuase they contain more energy.

this makes it much easier for gas molecules to diffuse.

also, gas moleclues are smaller particles, this makes it easier to mix more evenly.

hope this helps u



it does help! thx!!

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victor
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Post by victor » Wed Nov 09, 2005 11:22 am

thecow135 wrote:also, gas moleclues are smaller particles, this makes it easier to mix more evenly.
hope this helps u


Is it really smaller? How about this?
H2O (liquid) --heat--> H2O (gas)
is the H2O gas has a smaller particles (whether in atom size or bond length) compared to the liquid one?

Um, to make it more clearly, let me add a little...
If we give heat on something, then it will change form: solid --> liquid --> gas. We know that heat is also one of the energy so, gas has the most energy level compare to those two.
And to eliminate the excesses energy, gas molecules use the energy in the form of Kinetic energy (that's why gas can diffuse faster).
For the smaller particles, I don't think so....and I think gas is easy to diffuse not because their particles are smaller but there're so much space between those molecules... :lol:
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Post by sdekivit » Wed Nov 09, 2005 3:56 pm

let's introduce the term diffusion coefficient.

The diffusion coefficient is defined as the mean free distance squared divded by the time of collision:

D = <l>^2 / t(c)

Working this out, the diffusion coefficient in gasses (!) is directly related to the volume that a molecule occupies (and thus reversed related to the density)

--> thus the higher the density of the molecule, the lower D, thus the less diffusion in gas.

Diffusion in liquids is described by the Brwonian movement:

D = kT / (6 * pi * viscosity * a)

--> a = radius of the molecule

--> the bigger the molecule, the higher a gets --> the lower the diffusion coefficient in a liquid

Thus: for example: air contain oxygen with a radius 0,2 nm and water a radius of 0,15 nm

--> in water whhich of the two will diffuse faster

Nonetheless O2 is a gas, it's radius is higher then that of water and there fore diffuses more slowly than water.

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