The method for determining a foam which forms within the liquor 17 of a washing machine located in a tub (2) uses electrodes 16 to which a measuring voltage is applied. By determining the electric field between the electrodes 16 and assigning a measure of the amount of foam to the magnitude of the electric field, the formation of foam can be detected in good time, especially during a wetting or start of a wash cycle of a laundry treatment process, by taking measures In order to prevent, not only for elimination, harmful foam formation, before the washing mechanism is already impaired over long stretches of the treatment process. A device for carrying out this method consists essentially of a transducer 14, which within a channel-like housing 15, which can be traversed from bottom to top of liquor 17, two electrodes 16 whose existing in their distance space electric field on the electrical conductivity of Lye closes. This conductance G changes significantly when the liquor carries 17 foam bubbles.
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