A process for producing milk foam includes pumping milk through a milk line with a milk pump having an adjustable speed for adjusting the capacity of the milk pump. Milk from the milk line and air are mixed inside a first mixing chamber to produce a milk foam. Properties of the milk foam, including a consistency of the milk foam, are a function of the speed of the milk pump. A device for producing the milk foam includes a milk container； an outlet； a milk line connected between the milk container and the outlet； a first mixing chamber installed in the milk line to mix milk and air to produce milk foam； and a milk pump having an adjustable speed coupled into the milk line.
