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# Isotherms? Watch

1. Hi guys,
I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

I've searched it but I still don't understand it either in or out of context.

So, what does Isotherm mean?

Thanks for any sort of explanation
2. (Original post by JustMee :))
Hi guys,
I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

I've searched it but I still don't understand it either in or out of context.

So, what does Isotherm mean?

Thanks for any sort of explanation
ISO = "the same"
THERM = "heat"
3. (Original post by JustMee :))
x
Both the Langmuir and Freundlich isotherms plot the extent of adsorption against adsorbate concentration (either in the air or in solution) at a given temperature (hence isotherm). The two isotherms can be used to model the same behaviour; the key difference lies in the mathematical formulation of the isotherm.
4. (Original post by JustMee :))
Hi guys,
I'm doing some work on Adsorption and it mentions 'Determination of adsorption isotherms'. there are two methods of analysis : Langmuir Isotherm and Freudlich isotherm.

What I don't understand is the term Isotherm and the graphs that go with the methods of analysis

I've searched it but I still don't understand it either in or out of context.

So, what does Isotherm mean?

Thanks for any sort of explanation
The graphs are a plot of surface coverage vs pressure of adsorbate. Don't worry too much about actually understanding this! I did the freundlich isotherm for my coursework and I didn't really understand the isotherm properly. Focus more on the theory of adsorption!

The langmuir (I believe) is has a simpler theory to it (it can be very easily derived).

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