I understand the pre-boil to post-boil gravity of wort is directly proportional to the amount of boil-off... same qty of sugar, less water.
Why doesn't the fall-out of proteins from the wort affect the gravity? During boil a lot of material drops out of the fluid. Suppose we replaced the water lost during boil - after the boil the fluid appears less dense as evidenced by the hot break fall-out and increased clarity. Apparently the material that fell out of the wort didn't contribute to the gravity in the first place? If that's the case, what is different about the nature of the material that was removed?
Why doesn't the fall-out of proteins from the wort affect the gravity? During boil a lot of material drops out of the fluid. Suppose we replaced the water lost during boil - after the boil the fluid appears less dense as evidenced by the hot break fall-out and increased clarity. Apparently the material that fell out of the wort didn't contribute to the gravity in the first place? If that's the case, what is different about the nature of the material that was removed?