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In relation to the problem of supercooling for ice storage devices, various kinds of experiments were carried out to find some factors which control the supercooling phenomenon. The following were selected as the external factors: rubbing glass with glass in water, collision of a solid in water, convection generated by rotating a solid in water, a jet stream, vibration and shock. It was found that factors such as convection, vibration and non-contacting shock have no effect on the freezing of supercooled water. They seem to be just adding some positive energy to water. On the other hand, collision or rubbing between solids or between a solid and a liquid surface in supercooled water helps the water to freeze. We believe that the growth of the ice embryo is induced by making the water molecules closer to each other, whose motion was restricted by a solid or liquid surface.