Thanks, Stefan. This is an excellent article about the fundamentals in terms a layman can grasp. The terminology we use is important. I liked (and use myself) the term “geometric pitch” as Agus used in his comment. And when I began measuring in the method you describe I measured the hypotenuse rather than side B for the simple reason that my caliper can nail it to .001 inches. I use the term “bite” for side “a” and the term “sweep” for side “B” which you described as the shadow the blade would make if lit from above on the table. I will be sending links to this article for folks to read who are interested in discussing the nuances of measuring their own propellers!
As with a solid dissolving in a liquid, a gas dissolves in a liquid more easily with agitation or mixing, but that is where the similarity ends. Remove a carbonated beverage from its container and it becomes obvious that pressure is necessary to keep the gas in the liquid. The drink fizzes and bubbles, releasing the gas. As the beverage sits for a few hours, the taste becomes what we describe as 'flat.' Almost all of the carbon dioxide has escaped from the liquid. The only CO 2 remaining in the water will produce a partial pressure equal to the partial pressure of the gas in the atmosphere. Water carries dissolved oxygen from the partial pressure of the oxygen in the atmosphere.