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Pressurised Immersion

IM 4.03.1 How Much Pressure?

A range of immersion brewers use pressure as part of the extraction and filtration processes. This category includes, along with the AeroPress, the syphon and the more recently invented SteepShot brewer, because they utilise pressure to extract the coffee. Aerobie Inc. have estimated the amount of pressure that is achievable with a medium or high amount of arm action from a barista: 

‘The AeroPress filter is 2.5 inches in diameter so the area of the filter is 4.9 square inches. If you press down firmly on a scale,