https://www.openlearning.com/u..../mangumkeating-spsv7
Buying an Espresso Coffee Machine Espresso machines heat the water to a temperature near boiling. They then push it under high pressure through tightly packed ground coffee in portafilters. They can also be used to create milk-based drinks. The majority of espresso machines can be programmed with settings that can alter the strength and the size of the drink. They may also feature proportional-integral-derivative (PID) temperature controls, which monitor and control on-off cycles to keep the boiler at
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