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Gravity is slightly stronger over places with more mass underground than over places with less mass. NASA uses two spacecraft to measure these variations in Earth’s gravity. These spacecraft are part of the Gravity Recovery and Climate Experiment (GRACE) mission.
Sparging – If you sparge too quickly, have a poorly designed mash tun filter, or sparge the wrong volume you can get a low OG. Take your time when sparging, which will let the wort extract as much as possible from the grain bed. For example, a 10% increase in final volume can result in a 10% decrease in OG.
Change yeast and mash higher is the most balance way to increase the FG….Brewers have three ways (that I know of) to influence attenuation:
While caramelized sugars are generally not fermentable It’s clear that not all of the sucrose is converted to caramel compounds. toasted or “caramelized” sugar would make something similar to a Bochet.
From BrewWiki. Specific Gravity (SG) is a measure of the relative density of one material compared to another. For brewing, the reference material is water, so the specific gravity of wort or beer is simply the density of the liquid divided by the density of water.
Centre of gravity. Centre of gravity, in physics, an imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be concentrated.
The centre of gravity (COG) of the human body is a hypothetical point around which the force of gravity appears to act. It is point at which the combined mass of the body appears to be concentrated. Because it is a hypothetical point, the COG need not lie within the physical bounds of an object or person.
Your center of gravity is the balance point in your body. It’s the point at which your upper and lower body weight is balanced. Typically, this is just below the belly button and half way between the lower back and belly when a woman is standing upright.