Lots of coffee machines use pressure to enhance brewing parameters. Some of the devices that work with pressure are single serve coffee machines, such as Keurig, or Tassimo, and espresso coffee machines. Other devices are the Moka pot, or steam espresso coffee makers. Pressure is measured in bar. The bar is a non-SI unit of pressure, defined by the IUPAC […] This dictionary word firstly appeared at The Dictionary of Coffee Terms, a website publishes and maintains a free online coffee and espresso related Dictionary.