Device for analyzing a mixture of n gases, comprising a microfluidic channel (2) extending between a first end and a second end, at least n−1 suspended elements in the microfluidic channel (2), said n−1 elements (S1, S2 . . . Sn−1) succeeding one another from the first end of the microfluidic channel (2) to the second end of the microfluidic channel (2), heating means capable of heating a part at least of the gaseous mixture surrounding each suspended element (S1, S2 . . . Sn−1) to a given temperature different to those to which are heated the gaseous mixtures surrounding the other suspended elements (S1, S2 . . . Sn−1), means of measuring the temperature or the variation in temperature of the suspended elements (S1, S2 . . . Sn−1) and a control and measurement system (UC) connected to the heating means and to the measuring means.