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It states that:

At a constant temperature, the amount of a given gas dissolved in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.

Formula and Henry constant

A formula for Henry's Law is:

$e^{p\,} = e^{kc\,} \,$

where:

$p\,$ the partial pressure of the solute above the solution

$c\,$ the concentration of the solute in the solution (in one of its many units)

$k\,$ the Henry's Law constant, which has units such as L·atm/mol, atm/(mol fraction) or Pa·m³/mol.

Taking the natural logarithm of the formula, gives us the more commonly used formula:^[1]

$p = kc \,$

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Formula and Henry constant