Henry's Law is for a gas dissolved in a liquid and states P = kC where P is the partial pressure of the gas above the solution and C is the concentration of the gas dissolved in the liquid. The k is a "constant", that is, it is independent of P, C and time but depends on the type of gas and the type of liquid. According to Pickover, page 184 (reference below), Henry's Law assumes:
A1. the gas/liquid system has reached equilibrium, and A2. the gas does not chemically react with the liquid, and A3. the concentration of gas in the liquid is low, and A4. the gas pressure is low.
I would be grateful for any help in answering the following:
Q1. Is the list of assumptions, A1 to A4, correct and complete? I have no reason to doubt it but I would like to confirm it.
Q2. Some authors (e.g. Dickinson E.J., Road Materials and Pavement Design, 2000, 1(3), 255-280) have applied Henry's Law to the diffusion of oxygen in air at atmospheric pressure into bitumen which is a semi-solid at room temperature. Is there any experimental evidence that Henry's Law can be extended to such a system?
Reference Pickover, C., "Archimedes to Hawking", Oxford University Press 2008