Hi, I have a very interesting but challenging question. Consider any chemical reaction that involves gas production (e.g. H2 gas is produced in KOH etching silicon). As we know, the produced gas will detach from the surface and reaction can continue. What if the gas doesn't detach from the surface and form a thin film? The gas will stop the reaction from continuing! So the question is how I can study the volume of the gas produced that stops the reaction? Any materials or concepts that might be relevant?