Hi David, I love physics. There are dynamic effects. The drag on each particle of grind is proportional to the flow velocity squared. So the dynamic drag on particles pushes them downward, compressing grind below. Then phenomenon below begin. I think that we can visualize any strata of grind as being sufficiently dense to behave approximately like a porous semi-solid. Pressing hard causes that strata become more densely packed and to also compress the grind below it. As we press, the more we compress the slurry, the greater this effect. There is no doubt that the pressing hard blocks flow and pressing gently gets the job done.
- previous post: Do both the original and the Go have the same "bottom" side that sits on a cup, i.e. can they accommodate the same cup "top opening" diameters? Or is the Go smaller and only able to use the provided cup? Or does the original have a broader range of cup sizes that can be used with it? – From Amy S.
- next post: When do you know it is time to replace your Aeropress? I've had mine for about five years. It does have visible scratches, but still seals properly. – From Rachel S.