A set of experiments was conducted to observe the stability of a vapor nucleus trapped inside a small glass capillary for water at a uniform superheat. The glass cavity was of a shape that allowed the incipient growth and collapse of the nucleus to be clearly distinguished. Photographs showing the nucleus instabilities are presented at one of three different system pressures used in the experiments. The observed stability of the nucleus and the measured superheats corresponding to the incipient instabilities agree with predictions based on a previous thermodynamic analysis.

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