The universal/molar/ideal gas constant R is given by
R=PV/nT; this however, on an average, is considered true for gases (H2, O2, N2 are excluded). Involving R in chemical expressions dealing with gases is understandable; but could it's inclusion in the chemical equations, primarily evolved for the gases and later being used for liquids as well be justified? To be more specific, I am talking about the Dubinin isotherms which are also being used for modelling the adsorption of adsorbates present in a liquid, uses the term RT for determining the adsorption energy. Is it justified? Please enlighten me; I am eager to hear from you.
Why not to look at Wikipedia before asking this question
https://en.wikipedia.org/wiki/Gas_constant
R is the product of the Boltzmann constant and Avogadros number. Hence , R is universial. In general adsorption models are so-called grid models treated in statistical thermodynamics. In these models when you go from individual particles to a mole, you go from k_B to R.
Dear Ahmed Alaa Hussein and Zahraa S. Mahdi . "Following" is not an answer but an attempt to increase you RG score. Ask yourself who is interested in your "following?"
Dear Yurii V Geletii , I want to see comments of this question, therefor I comment
It is enough to change the temperature or pressure a little and instead of a liquid one can get gas and vice versa. R is a universal constant. Regards,
The thermal energy is denoted T by theoreticians, kT by experimental physicists and RT by chemists, but it is always the same thing.
I think the most fundamental explanation for the "universality" of R comes from Boltzmann's constant k. The thermal energy per particle (such as a molecule) is kT (T is the temp in Kelvin for instance), while the same energy per mole is RT. (I think this was noted previously)
The importance of k or kT is it's role in Boltzmann's factor for ratios of energy boccupancy, through the exponential term exp(-E/kT) or exp (-DeltaE/kT).
There is a wealth of information on the Boltzmann principle,l on statistical physics, which should shed light on its broad application. This is why k and R are found in all areas and not just ideal gases.
Hope this helps!
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