I've been playing around with filtration methods, and got my hands on a casting machine for this purpose.
My first mission was to find out how porosity can affect filtration. To see this for myself, I just ran some titratable solvent through the membrane I produced, and analyzed the difference in concentration.
Looking through some textbooks, I found a neat formula for calculating porosity, but there's one thing that's been bugging me. The formula requires the density of the membrane.
This isn't something that I can just use the Archimedes Principle to get. I need to look at the wet weight and dry weight of the membrane or whatever.
My dilemma right now is I can't find a single resource that lets me measure the density of a membrane without requiring either some pricey machine or extremely esoteric methods that's beyond my abilities. I'm really at a loss right now for this particular method.
There's this equipment here that's usable, but that looks like one high-end son of a gun. I really don't want to throw any more money than I already have.
How do I measure the density of a membrane with tools available in the home?