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Specific gravity in brewing is the ratio of the density of the wort to that of water.

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418 views

Why did I miss my high target gravity? By quite a lot. Is it just my brewhouse efficiency?

I cooked up my first Double IPA recipe over the weekend but have seriously missed the mark with the target gravity. So much so it most definitely won't be a Double. Target O.G. = 1.085 Actual O.G. = ...
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3answers
64 views

Malt bills - Potential extract weight per volume of wort required for target gravity

I'm looking to understand malt bills a bit more. I'm currently reading "Malt - A Practical Guide from Field to Brewhouse" by John Mallet. I'm particularly interested in the section describing the ...
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3answers
57 views

Why not to calculate specific gravity through weight?

I have read that you can calculate specific gravity by dividing the weight of a known volume of liquid in the weight of a known volume of water. After reading that I thought about filing my fermenter ...
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2answers
209 views

Sugar in water effect on specific gravity?

Is there an equation or relation to describe how much sugar is to be added to water to obtain a liquid with a specific gravity? In This question, for example, it is mentioned that "1 lb in 1 gallon ...
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2answers
61 views

ABV from one SG?

The most common way to calculate ABV (Alcohol By Volume) is through some correlation between Original Gravity (OG) and Final Gravity(FG). Is there any way to calculate ABV just from the current ...
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4answers
108 views

Correct temperature effect on Specific gravity

Is there an equation that corrects specific gravity while considering temperature effect in Celsius, which does not presupposes a set hydrometer calibration temperature? A direct relation, not tables ...
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3answers
27 views

What is the table sugar to invert syrup yield, in mass?

Brewers can make their own invert syrup (Belgian candi syrup) by heating regular granulated table sugar, water, and a little acid. https://www.homebrewersassociation.org/how-to-brew/invert-syrups-...
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2answers
62 views

Estimating OG when only pre-boil gravity available

Is it possible to estimate the post-boil specific gravity given only a pre boil gravity reading, plus volume measurements, while also accounting for a invert sugar syrup addition? For example, say ...
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3answers
2k views

Diluting beer after 11 hours of fermentation. What to expect?

Ended up with too high gravity wort. Since I was not prepared for this I didn't have enough sterile water to dilute the wort. I ended up pitching the yeast anyway and adding sterile water at 11 hours ...
2
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2answers
45 views

Starting gravity reading when not all fermentables are dissolved

Is it possible to get a useful starting gravity reading when not everything is dissolved or suspended, but you know it ultimately will be? Some context: In my pre-hydrometer days, I made a few cysers ...
2
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1answer
88 views

Formulating a recipe with birch sap

Background Based on my searching here and elsewhere, brewing with birch sap is quite uncommon with brewers (although I did find one brewer that mentioned brewing with maple sap). So I'd like to get ...
0
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1answer
307 views

Specific Gravity too low

I started my latests batch of IPA (from a Wilko kit) off 19 days ago. Unlike my previous attempts, fermentation began rapidly and consistent. It has slowed down over the past couple of days so today ...
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1answer
140 views

What does a gravity reading really mean?

The simple/short version of the question: What does a hydrometer gravity reading of 1.036 really mean? Does it mean the density of the liquid is 3.6% greater than that of distilled water (ignoring ...
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2answers
342 views

How can I save a wine with SG way too high?

I am attempting to make a blackberry wine from blackberries picked in my yard. I followed a recipe found online, adding sugar disolved in water to a bunch of mashed up berries in a mesh bag, etc. I ...
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1answer
439 views

specific gravity in wine making

I'm trying to make wine out of pomegranate juice, its almost a month that the must is fermenting but when I read the specific gravity with the hydrometer is always around 0.008. If a try to calculate ...
2
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1answer
98 views

Refractometer or options?

I have advanced to a very prolific brewer and have mastered many aspects of home brewing. For some reason I seem to be unable to master the issue of Specific Gravity. Try as I may, I just do not ...
0
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1answer
82 views

Gravity concerns slow fermentation

I have returned to home brewing after a long leave of absence and would be very grateful for some advice just to make sure my wort is still going in the right direction as I am getting a bit concerned....
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1answer
54 views

Higher starting gravity

Is it true to get a higher S.G. you can by add extra Suger and fermentables like extra suger DME. I 'm trying to find a way to raise, The S.G and F.G to get a higher ABV.
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3answers
235 views

How much will initial oxygen in wort affect final alcohol in beer?

According to White and Zainasheff: Yeast: The Practical Guide to Beer Fermentation By Chris White and Jamil Zainasheff, wort should have 10 mg/L (10 ppm) with dissolved oxygen before pitching. This ...
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2answers
1k views

Specific Gravities for Kombucha

The most-recent episode of Basic Brewing Radio has got me thinking about making Kombucha. What would be a typical OG (original gravity) and FG (final gravity) for a Kombucha?
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1answer
336 views

What is too high a gravity to bottle condition cider?

I tasted my cider today and if I could bottle it now I would. The only problem is that the gravity is at 1.012. My concern is that I could create bottle bombs if I bottled it now. Is it possible to ...
1
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1answer
71 views

Increase gravity in secondary

I added a pot of coffee to my secondary without thinking much about the water content. Now the SG is lower than I want (weak body). Could I put it back into the kettle and boil the excess water off ...
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2answers
131 views

Can I fix a higher than anticipated OG after primary?

I just brewed a witbier that was way below the estimated preboil gravity of 1.49. I only got 1.34 in case you're wondering. I've never had that bad of an efficiency before. The grains came ...
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3answers
365 views

Used Wrong Yeast… Final Gravity Too High

I am considering two techniques for lowering my specific gravity but am unsure if my methods will work. I am currently fermenting a bock style. It's not a true bock because I don't have the ability to ...
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1answer
117 views

Checking gravity at mash out.

I'm still very new to all-grain, 7 batches in, so I am still a little shaky with procedure. The other day before my last batch I was re-reading "how to brew and noticed that John Palmer recommends ...
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3answers
188 views

Safe to return sampled wort to the primary after sampling?

I made my second batch of beer (ever) last Friday night, and in a few days' time I'd like to sample a bit of it so that I can check its gravity. Provided that I sanitize all of my equipment (siphon, ...
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1answer
359 views

Determine honey density and needed volume for target starting gravity

Suppose I have honey of unknown specific gravity. I want to mix a mead must with a target specific gravity g_t and volume V_t. How do I determine how much honey to use?
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2answers
76 views

Stalled fermentation

I've started brewing an Oktoberfest. It has been in primary for a little less than a week. The first 24 hours was good, super active. After about a day, it got pretty warm here, and the ...
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1answer
88 views

Large drop in specific gravity over 24 hour period

My cider brew (5 gal) has experienced a large drop in its specific gravity readings over a 24 hour period. Yesterday it was measured at 1.05 with the kit recommending bottling at 1.04 or lower. Today ...
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1answer
72 views

Specific Gravity Reading

So with your help I've made into secondary fermentation of my first hard cider batch. I just have a question about specific gravity. I started with a reading of 1.060.I measured it again from a ...
2
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1answer
92 views

How much free (ie, fermentable) suger is contained in canned fruit puree and how does this affect gravity?

Going to add one can (49oz) of Vintners Harvest Peach Puree to secondary and curious if/how much this will raise gravity. The nutritional label states the can contains 190 grams of sugar, but not ...
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2answers
216 views

FG of bottled condition beer lower than FG of fermented beer

I brewed a session stout about 4 months ago, and left it in the fermentor for two weeks. The FG was 1.012 one week in, and I checked every few days until 2 weeks in, and the FG remained at 1.012. I ...
2
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2answers
662 views

Specific gravity after adding cold-pressed coffee?

Like an amateur, I forgot to measure my cold-pressed coffee's gravity before combining in secondary. Anybody have an estimate of the gravity of a 24-hour cold-pressed steep? I started with 36 ounces ...
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2answers
623 views

Specific Gravity: Refractometer and Hydrometer Disagree

I have tried to use a refractometer when brewing. I can never get an accurate pre-boil specific gravity reading that consistently aligns with my post boil, cooled wort hydrometer reading. I spoke ...
0
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1answer
114 views

Testing specific gravity before bottling

I brewed a batch of beer about 3 weeks ago, and I was told to test the gravity prior to bottling to make sure it is ready. My question is, will I do any harm by opening the fermentation bucket in ...
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1answer
103 views

How to get a feel for the numbers involved in brewing

So I drink a lot of beer (go figure) and I try to characterize it each time. How much carbonation there is, what color it is, mouth feel, what specific flavors are involved, how hoppy it is, how malty ...
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4answers
563 views

Hydrometer broke, no original gravity

on brew day of my first batch, when i was ready to take OG reading, i dropped my hydrometer so no OG. Is there a way to get a rough estimate of the OG. Thanks
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3answers
239 views

Muntons pilsner specific gravity not coming down

I'm relatively new to homebrewing and I tried a Muntons Extract Pilsner kit. I followed the instructions on the kit to a T and after 3 weeks (and having read other questions and comments on this site)...
2
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1answer
711 views

Plato degree to specific gravity conversion question

I have a question regarding the conversion from Plato degrees to specific gravity, and the widely used value of 46ppg for sugar dissolved in water. According to wikipedia, plato degrees are defined ...
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3answers
5k views

When/How to Measure Pre-Boil Gravity to Determine Mash Efficiency

I routinely take my pre-boil gravity after sparging to determine mash efficiency so that I can throw in DME or Dextrose for a lower than expected yield or add water for a higher than expected yield, ...
3
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3answers
528 views

DIY BrewBug based offerings?

BrewBug, is a neat little toy that essentially has a "floating bob" that measures the temperature and specific gravity of the wort as it is fermenting, allowing for niceties like changing the ...
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2answers
130 views

Is my SG too low? [closed]

I have an SG of 1,040, and the target OG is about 1.065. I was wondering if this is too low? Should I add more water?
2
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1answer
2k views

first stage beer seems slow (stopped?)

My first brew! I forgot to add yeast and put it in a day later. #embarrassing I took a SG reading after 5 days: 1.018 I took another reading today, 7 days in, and it's only dropped to 1.016. The ...
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5answers
3k views

First brew… 1.010 gravity in 72 hours?

I'm in the middle of my first brew and I'm having some issues. Not sure if I have completely ruined this thing or what. Heres the deal... During the process, everything went pretty much as planned ...
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1answer
477 views

Does any “probe” exist which can detect the gravity of wort?

I use a Raspberry Pi in combination with a temperature probe to measure the temperature of my wort. It would be nice if I had another probe that could measure the current gravity of my beer, so that ...
2
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3answers
884 views

What can I learn from fruit beer gravity?

I just bottled a batch of a watermelon beer where the gravities going into and out of primary matched the predictions (OG 1.050, FG 1.012). I added watermelon chunks in secondary and when it finished ...
2
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1answer
51 views

FG dropped after wort cooled

Did a brew yesterday, hit the desired SG after the boil time - or so I thought. After cooling the wort, the SG dropped 2 points. What would cause this?
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1answer
742 views

Why doesn't FG reach 1.000?

My second beer brew has pretty much finished its primary fermentation. It started at 1.044 and is currently at 1.014... I don't expect it will go much further. Having brewed numerous wines I ...
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2answers
11k views

Seeking formula for adding sugar disolved in water to produce specific gravity

I have seen several tables, notably, http://winemaking.jackkeller.net/hydrom.asp http://www.beer-wine.com/learning/how-adjust-specific-gravity http://www.brsquared.org/wine/CalcInfo/HydSugAl.htm ...
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1answer
315 views

Why is it necessary to approximate starting and finishing gravity?

In the book "Home Beermaking", by William Moore, it talks about calculating starting and finishing gravity in chapter 6. I believe that he's talking about when I get good enough at homebrewing to make ...