Give the expression of Freubndlich isotherms.

Explanation

### Step-by-Step Solution:

1. **Understanding Freundlich Isotherm**:
The Freundlich isotherm describes how the amount of gas adsorbed by an adsorbent varies with pressure at a constant temperature. It is particularly useful for heterogeneous surfaces.

2. **Expression of Freundlich Isotherm**:
The Freundlich isotherm can be mathematically expressed as:
\[
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