Question

Which of the following is correct adsorption isobar for physisorption ?
Here,
$\left(\frac{x}{m}\right)$ is extent of adsorption per unit mass of adsorbent

Answer 1

Adsorption Isobar
The variation in the amount of gas adsorbed by the adsorbent with temperature at constant pressure. It can be expressed by a curve termed as adsorption isobar.

At constant pressure P,

$x$ is the mass of the gas adsorbed.
$m$ is the mass of adsorbent.
$\left(\frac{x}{m}\right)$ is extent of adsorption per unit mass of adsorbent

For physisorption
With increase in temperature, physical adsorption decreases continuously
Hence the curve obtained is: