a round rod 12 made of teflon r was placed into the container the round rod had an outer diameter and a length smaller than the inner diameter and the length of the container respectively super pure water was poured into the container such that the lower portion of the round rod was located under a gas liquid interface next a plate having an opening with a size allowing insertion of the container was prepared the container 11 was inserted through the plate 13 so that the container might be immersed into a coolant inside a supercooled bath 14 the super pure water sample was cooled by the above apparatus and kept at a constant temperature slightly lower than 0 u00b0 c thereby forming a supercooled state vibration was applied at a relatively low frequency upon the container by hand for example at 5 to 10 vibrations second for a few to a dozen seconds thereby the round rod was vigorously contacted with the inner wall of the container thus the supercooled water inside the container was stirred splashed waves are formed and liquid drops were scattered then an infinite number of the liquid drops of the supercooled water were continuously crashed upon the inner wall of the container so that the infinite number of the bubbles were mixed into the supercooled water 0042 fig6 shows the relationship between the absolute figure u03b4t the supercooled degree of the difference between the freezing temperature and 0 u00b0 c and the.