In previous report, we observed the motion of an 1.8uL air bubble in 6.0wt%CMC aqueous solution under pressure-oscillating field. The bubble exhibited an elliptical shape flattened in the vertical direction under strong pressure-oscillation. In this study, we report the effect of the condition of pressure-oscillation and rheological property of CMC aqueous solution on the unique bubble shape. It was found that a certain level elasticity would be required to be the unique shape. Therefore, unique shape would be depended on the condition of pressure-oscillation and the rheological property of CMC aqueous solution.
