this post was submitted on 24 Mar 2024
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Coffee
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Your last point about concentration could also explain @Uninformed_Tyler's thoughts about the AeroPress being somewhat forgiving. Most of the extraction takes place when the water is clean, then the rate of extraction drops off quickly and then idles along for a bit - so the cut off time is not so critical.
Also the temperature plays a big role. There’s no risk of having 200 °C steam passing through the grinds. Quite the opposite really. You’ll start with roughly 99 °C, but that drops quite quickly into a more forgiving territory.
Theoretically, pressure is another important variable, but since most methods just use atmospheric pressure, so there’s nothing you can do about it.
If you end up with bad coffee, it usually means your measurements are way off. Some people also end up doing the extraction on the kitchen floor instead of inside the cylinder, which isn’t ideal for the temperature.