Abstract: The invention relates to a real-time adaptive measuring method for determining the thermal conductivity K between a sensor and a medium, and/or for determining the thermal capacity C of the sensor and the temperature of the medium by means of the sensor that is in thermal exchange relation with the medium by changing the temperature of the sensor by means of supplying thermal power to the sensor and by measuring the thermal power supplied to the sensor. Therefore, it will be possible to distinguish between changes in the thermal power that are caused by a property of the medium and those caused by changes in the temperature of the medium.