We investigated the steady states of two valve-connected balloons with different pressure. When the valve is opened, the air flows between the balloons until the pressure in the balloons equalizes. This condition may or may not be stable. Stability is understood as the ability to keep the system in balance despite a minor disturbance. To determine the characteristics, we first carried out the experiment. We measured the pressure and volume using image measurement software. Next, we plotted a theoretical curve using the Mooney-Rivlin rheological model. A comparison of these two curves and an analysis of stability followed. We also wrote a program which calculates the flow of air and shows the change in pressure in the balloons. We concluded that the slope of the characteristic curve conditions the stability.
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