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According to BYO malt absorbs roughly 1.04L of water per kg malt. Knowing this makes calculating things like mash and sparge water quite a bit easier.

Is there a rough absorption rate for hops?

I've searched round the web but cannot seem to find anything. I guess it may vary according to the hop size and density, but some rough figures will help with calculations like topping up water and rackable post-fermentation volume.

Is there a difference between adding hops in the boil vs dry hop?

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    Good question. I suspect it must be something. If I put 2oz of hops into my hop spider, when I dump it out it must may weigh more than 2oz right? I suppose a way to test it would be to put 1oz in and when you pull your spider or hop back out weigh it? – sniperd Oct 26 '18 at 17:45
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I use an Italian made brew calculator, Calcoliamo Birra, app that calculates hops water absorption at 0.12 qt/oz which is about half a cup per ounce.

Update: Last night I made a hop tea to increase the bitterness in a pilsner I wasn't satisfied with. I decided to collect some data for hops liquid absorption while I was at it. I boiled one ounce of Saaz pellets in a quart of water for 15 min, then pours the contents through a strainer lined with cheese cloth to filter the hops particles. I then let it sit until no more liquid was dripping. I then transferred the hops to a graduated measuring cup. The final volume was right at 1 cup maybe a little under. The 1 ounce of Saaz took up about a quarter of a cup, preboil. The hops absorbed approximately 3/4 of a cup of liquid in the 15 min boil.

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Beer-N-BBQ by Larry says hops absorb 0,0033L of wort per gram. I don't know where the value actually comes from though.

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