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A graph between \( x / m \) and the pressure \( P \) of the gas at a constant temperature is called adsorption isotherm. Where \( x \) is the no. of moles of the adsorbate and \( m \) is the mass of the adsorbent. Adsorption isotherms of different shapes have been experimentally observed. According to Frundlich adsorption isotherm.
\[
x / m=k P^{1 / n}
\]
where \( k \) and \( n \) are constant parameters depending upon the nature of the solid and gas.
Adsorption isotherm of \( \log \left(\frac{x}{m}\right) \) and \( \log P \) was found of the type :
This is true when :
(a) \( P=0 \)
(b) \( P=1 \)
\( \log \left(\frac{x}{m}\right) \)
(c) \( \frac{1}{n}=1 \)
(d) \( P1 \)
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