State Henry's law correlating the pressure of a gas and its solubility in a solvent and mention two applications for the law.

Explanation

### Step-by-Step Text Solution

**Step 1: State Henry's Law**
Henry's Law states that at a constant temperature, the solubility of a gas in a liquid is directly proportional to the partial pressure of that gas above the liquid. Mathematically, it can be expressed as:
\[ S = k_H \cdot P \]
where:
- \( S \) = solubility of the gas in the liquid
- \( k_H \) = Henry's law constant (specific to each gas-liquid combination)
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