Henry's Law
Where;
e is approx. 2.7182818, the base of the natural logarithm,
p is the partial pressure of the solute above the solution,
c is the concentration of the solute in the solution,
k is Henry's Law constant,
Taking the natural logarithm of the formula, gives us the more commonly used formula: p = kc
Note that the Henry's Law constant, k, varies with the solvent and the temperature.