A research group led by Professor Byung Mook Won from Sungkyunkwan University’s Faculty of New Materials Engineering was successful in capturing a water drop’s evaporation for 0.3 seconds. The head of the group announced on April 4th, “We have initially made a success in watching the process of evaporation of water drop 214fL in volume. The abbreviation in this case ‘fL’ denotes one liter over a quadrillion.
The group captured the scene of the process in which a water drop becomes invisible as it is squeezed between micro particles by using an ‘Ultrahigh Speed X-ray Nano Picture Beam Line’ that belongs to Pohang Laboratory. The result from the study shows that the internal pressure of water drop is 0.6, which is lower than that of the air. The speed of the evaporation was one-sixth the speed a normal water drop evaporates. As a result, the hypothesis that the speed of evaporation of a squeezed water drop may be slower than usual has been proved.
Prof. Won says, “The evaporation slows down as it becomes harder for the vapor to escape from the water drop on account of the lower internal pressure compared to the surrounding air. This discovery will contribute to the understanding of the formation of clouds and the control of nanoparticles.
The research group’s findings have been posted on Scientific Reports in cooperation with Nature.
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