I usually take a hydrometer reading immediately after sparge so that I can calculate total points of gravity (i.e. gravity reading * volume), and from there calculate what volume of wort I should ...
Say I am brewing a beer that is supposed to have an OG of 1.050. I'm doing all-grain brewing and at the end of my mash & sparge, if I took the gravity at that point, what should I expect? I ...