# What is the equation form of Langmuir isotherm under high pressure ?

$(a)\;\large\frac{x}{m}=\large\frac{a}{b}\qquad(b)\;\large\frac{x}{m}=ap\qquad(c)\;\large\frac{x}{m}=\large\frac{1}{abp}\qquad(d)\;\large\frac{x}{m}=\large\frac{b}{a}$

Answer : $\;\large\frac{x}{m}=\large\frac{a}{b}$
Explanation :
According to Langmuir isotherm
$\large\frac{x}{m}=\large\frac{ap}{1+bp}$
At high pressure , bp > > 1
Hence , $\;\large\frac{x}{m}=\large\frac{ap}{bp}=\large\frac{a}{b}\;.$