Take the 2-minute tour ×  Often when I pour a sample to be
measured, there is a good 1cm of head obscuring the SG value. It
can stay around for quite some time.  Can I leave it overnight
in order to take the reading the next morning without some
mysterious (ie unknown to me) process changing the gravity
giving me an incorrect reading?  share|improve this question  4
Answers 4  up vote 4 down vote accepted  If you're talking about
a sample of wort before you've pitched the yeast, then I think
the only thing to skew a next-day reading would be a wild yeast
or bacteria.  If you're talking about a sample of fermenting
beer, then the yeast will be making the gravity go lower while
the sample sits waiting for you to read it.  share|improve this
answer If the container is sealed so you can discount wild yeast
& bacteria, the gravity will change, but it should be in line
with the vessel it's taken from, shouldn't it? –  Mark McDonald
Jul 10 '11 at 4:09 You can't discount it. Was the kettle closed
while chilling? Was