dukas Senior Member Joined: 21 Oct 2012 Posts: 9 Location: Florida Expertise: Just starting
Posted Thu Oct 25, 2012, 10:03am 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?
Posted Thu Oct 25, 2012, 10:50am 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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