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A compressor comprises an impeller (1) provided with a plurality of radial blades (4). The impeller (1) has an inducer diameter defined by the outer diameter of front edges (5) of the blades (4), and an outer diameter defined by the outer diameter of the blade tips (6). Each blade (4) is backswept relative to the direction of rotation of the impeller (1) with an angle of backswept in the range 45 degree to 55 degree. The ratio of the impeller inducers diameter to the impeller outer diameter is in the range 0.59 to 0.63. the ratio of the compressor diffuser outlet diameter to the impeller outer diameter is between 1.4 and 1.55.