Mixing Saturation occasionally occurs when two air masses mix. Mixing usually involves a change in both water vapor content and temperature. Consider, for example, two unsaturated air samples, A and B : 1. Use the table to find the saturation mixing ratio for air samples A and B . Do not round. A : r s = B: r 5 = 2. Find the mixing ratio values of samples A and B. Do not round. A : r = B:r =.