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1 does not equal 1
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dukas
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Joined: 21 Oct 2012
Posts: 9
Location: Florida
Expertise: Just starting

Posted Thu Oct 25, 2012, 11:03am
Subject: 1 does not equal 1
 

Common sense tells me that one level scoop of beans should yield *less* than one level scoop of ground coffee, since some of the fine grounds occupy the space that existed *between* the original beans.  However, I find that the ground coffee is *more* than one level scoop.  Do the bean fragments *expand* from being ground?
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germantownrob
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germantownrob
Joined: 2 Dec 2007
Posts: 2,152
Location: Philadelphia
Expertise: I love coffee

Espresso: Duetto 3, A Dead Oscar
Grinder: Vario-W, Preciso w/Esatto,...
Drip: Brazen
Roaster: Diedrich IR-1, HT B
Posted Thu Oct 25, 2012, 11:13am
Subject: Re: 1 does not equal 1
 

Different grinders will give different levels of grind volume. Going by weight is best when dealing with coffee.
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,404
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Thu Oct 25, 2012, 11:44am
Subject: Re: 1 does not equal 1
 

Beans on their own are more dense then the grounds.
 Beans are hard... Grounds are fluffy.
   words to live by.   ;-)

 
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dyqik
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Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Thu Oct 25, 2012, 11:50am
Subject: Re: 1 does not equal 1
 

It's down to the packing fraction of the beans vs the packing fraction of the grounds.

Beans are smooth, and slide past each other to pack fairly densely.  Grounds have sharp edges and don't slide past each other, unless a force is put on them (tamping) or they are shaken to settle the down.  Thus the packing fraction of undisturbed grounds is less than that of beans.  Once you are dealing with volumes around 5-10 times the size of the particle (beans or grounds) or larger the packing fraction has a bigger effect than the size of the particles on the volume occupied.
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JKalpin
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JKalpin
Joined: 28 Dec 2008
Posts: 801
Location: Thornhill, Ontario Canada
Expertise: I love coffee

Espresso: Aerobie Aeropress
Grinder: Baratza Maestro Plus
Vac Pot: Yama 5-Cup
Drip: Krups Moka Brew, BraZen
Roaster: Freshroast+8, Behmor 1600
Posted Thu Oct 25, 2012, 12:51pm
Subject: Re: 1 does not equal 1
 

While it does not make a lot of sense, I have found that one (Aeropress) scoop of beans roughly equals a scoop of ground coffee.  

Similarly, when I grind walnuts for my wife (using a coarse kitchen grinder-thing) ...when I grind one cup of walnut halves I get roughly a cup of pieces.  

Really, does everything have to make sense?

With my Aeropress, one slightly rounded scoop of beans gives me a consistent good cup.

However, with my Krups Moka Brew I wouldn't dare try that.  There, +/- 5 grams can make a big difference.  So I weigh 45g of beans for 1 litre of water.

The answer to the OP's question is:  It depends on ...where.

 
Jerry
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