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Old 01-03-2013, 03:06 AM   #21
ChemE
 
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Quote:
Originally Posted by Kaiser View Post
ChemE, you should stick with SI or US units
Meh, I'm more comfortable with grams than ounces for expressing small masses that's why I mix units freely. Also, chemical engineers tend to get pretty comfortable with both metric and Imperial. Point well taken though, I know some aren't comfortable converting between the two. Interesting about the trub though. Obviously my simple initial experiment didn't have any break material to confound the result.
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Old 01-03-2013, 04:17 AM   #22
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The missed mars once b/c of mixing unit systems

I'm obviously not as tied to the imperial system but I see that it works pretty well for most things here in the US.

Brewer's Friend has hop absorption set to 5 ml/g I don't know where this number came from and it may also be for pellet hops.

Kai

 
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Old 01-03-2013, 07:18 AM   #23
kingwood-kid
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Inspired partly by this thread, I got roughly 4:1 the one time I weighed with pellet hops. This was assuming a 5G paint strainer bag weighed nothing and absorbed no water, which I suppose could be considered a source of error. Since the dry weight of the hops was 6oz, I didn't feel that weighing the bag would greatly change the results.
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Old 01-04-2013, 01:33 PM   #24
ChemE
 
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Quote:
Originally Posted by Kaiser View Post
The missed mars once b/c of mixing unit systems

I'm obviously not as tied to the imperial system but I see that it works pretty well for most things here in the US.

Brewer's Friend has hop absorption set to 5 ml/g I don't know where this number came from and it may also be for pellet hops.

Kai
Yup, that was a classic engineering blunder to be sure! BIG difference between m/s and ft/s when it comes to landing on the surface of a planet!

So 5 ml/g wort/beer absorption translates into 4.8 fluid ounces per ounce of hops. My initial result was 4.68 fluid ounces per ounce of hops. I would call that some pretty darn good agreement.
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My Super Efficient 5-Gallon Mash Lauter Tun • Graduating Carboys • Leaf Hop Absorption Measured
Primary - Bemused Bitter, Munich Saaz SMaSH
Secondary - Air
Bottled - Oatmeal Stout 2011, Apfelwein, Withdrawn Wheat, Bourbon Barrel Barleywine SMaSH, Christmas Ale 2010, Perplexed Pale Ale

 
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Old 01-04-2013, 06:44 PM   #25
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I didn't realize that a fl oz of water doesn't weight an oz.

Let's abandon the use Imperial measurements for any scientific work right here

Kai

 
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Old 01-04-2013, 10:15 PM   #26
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Quote:
Originally Posted by Kaiser View Post
I didn't realize that a fl oz of water doesn't weight an oz.

Let's abandon the use Imperial measurements for any scientific work right here

Kai
Indeed. A fluid ounce is 29.5735 mL and an ounce is 28.375 g.
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My Super Efficient 5-Gallon Mash Lauter Tun • Graduating Carboys • Leaf Hop Absorption Measured
Primary - Bemused Bitter, Munich Saaz SMaSH
Secondary - Air
Bottled - Oatmeal Stout 2011, Apfelwein, Withdrawn Wheat, Bourbon Barrel Barleywine SMaSH, Christmas Ale 2010, Perplexed Pale Ale

 
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Old 07-21-2014, 02:59 PM   #27
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Just wanted to add my .02 cents. I made an IPA last night (7/20/14) and used 7 oz of dried whole leaf hops that I ordered from Hopsdirect.com in 1 lb bags. They are very dry and absorbed a significant amount of wort. To be more specific, my recipe was for 5.5 gal and my preboil volume was 7 gal. I assume an evaporation rate of 10% per hour. I decided on a 90 min boil and continuous hop additions every 10 min for 60 min. My final volume in my site glass said 5.5 gallons but once the kettle was drained I was a whole gallon shy of my 5.5 gallon mark! I lost 1 gallon of wort to 7 oz of whole dried leaf hops.

My only thoughts on combating this for future boils is to weigh out my hop additions and soak them in boiled water and add to the boil presoaked.

 
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Old 07-21-2014, 04:35 PM   #28
Denny
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Just collect more wort preboil.
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Old 07-21-2014, 06:22 PM   #29
droshi
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Not sure if anyone recommended. But I grind all my whole leaf hops in a blender. For me, grinding all hops, spices and pretty much anything used in the boil helps to settle it down to the bottom much better during a 20m+ whirlpool. It also helps for the mentioned water absorption problem where I can get a lot more clear liquid from a batch. 5.5g final boil volume gets me 5g of clear wort.

I do the same with dry-hopping, but since I do this in a keg I drop the ground hops into a muslin bag and use dental floss to tie it to the handle.

 
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Old 08-13-2014, 02:44 PM   #30
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hi guys, there's some good info for me in this thread - as i'm just now going to be using whole hops for the first time. i'm actually growing my own hops (chinook, cascade, & 2 x centennial). since they are first year plants i'm only going to use them for dry hopping in secondary fermentation. for a variety of reasons (timing mostly) i'm going to have to dry some of them., but am also hoping to use some of them fresh. as far as i can tell, OP's measurements were used with dry hops, correct? Obvsiously fresh hops will not absorb as much moisture, has anyone ever measured how much (if any) water is absorbed by fresh hops?

 
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