A method for characterizing the gas content of a medium that comprises a gas-charged liquid, using a measuring sensor that conveys the medium in at least one vibrating measuring tube, wherein the method comprises: Identification of a measured pressure value for the medium being conveyed in the measuring tube and of the resonant frequencies of at least two different vibrational modes of the measuring tube; Identification of an acoustic velocity value and a resonator density value of the medium on the basis of the resonant frequencies of the at least two different vibrational modes of the at least one measuring tube; Identification of a gas volume content of suspended bubbles in the medium on the basis of the resonator density value, of the acoustic velocity value, and of the measured pressure value; Identification of a value for the gas volume content of free bubbles on the basis of the resonator density value of the medium, and of the gas volume content of suspended bubbles, wherein the value for the gas volume content of free bubbles is proportional to a difference between an expected value of the media density on the basis of a reference density value of the liquid and of the gas volume content of the suspended bubbles on the one hand, and of the resonator density value on the other, wherein, in order to determine the value for the gas volume content of free bubbles, said difference is divided by a product of the expected media density value on the basis of the reference density value of the liquid and of the gas volume content of suspended bubbles on the one hand, as well as a correction factor on the other, wherein the correction factor is not smaller than 1 and not greater than 4, in particular not greater than 3. Identification of a measured pressure value for the medium being conveyed in the measuring tube and of the resonant frequencies of at least two different vibrational modes of the measuring tube; Identification of an acoustic velocity value and a resonator density value of the medium on the basis of the resonant frequencies of the at least two different vibrational modes of the at least one measuring tube; Identification of a gas volume content of suspended bubbles in the medium on the basis of the resonator density value, of the acoustic velocity value, and of the measured pressure value; Identification of a value for the gas volume content of free bubbles on the basis of the resonator density value of the medium, and of the gas volume content of suspended bubbles, wherein the value for the gas volume content of free bubbles is proportional to a difference between an expected value of the media density on the basis of a reference density value of the liquid and of the gas volume content of the suspended bubbles on the one hand, and of the resonator density value on the other, wherein, in order to determine the value for the gas volume content of free bubbles, said difference is divided by a product of the expected media density value on the basis of the reference density value of the liquid and of the gas volume content of suspended bubbles on the one hand, as well as a correction factor on the other, wherein the correction factor is not smaller than 1 and not greater than 4, in particular not greater than 3.