Answer:
The graph between amount
of gas adsorbed per unit mass of the adsorbent x /m and pressure of the gas at
a constant temperature is known as Adsorption Isotherm. After saturation
pressure there is no more adsorption on the surface.
At low pressure:
is directly
proportional to pressure
?
(i)
where k is a
constant of proportionality.
At high pressure:
The value of remains
same indicating that 
is independent of
pressure.
?. (ii)
At intermediate
pressure:
The value of is proportional to
some fractional power of pressure
??. (iii)
where n = 1, 2, 3,
4. ..
The equation (iii)
is called Freundlich adsorption isotherm.
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