Scientists have found that the film that creates soap bubbles is cooler than the surrounding air. article about it published In Physical Review Letters.
The researchers made this discovery by chance: They were studying the stability of the bubbles, using equipment that allowed them to measure the temperature of the bubble film. During the study, the physicists created bubbles using ordinary dish soap, water and glycerin. After the team discovered the temperature difference, they refocused their efforts to learn more. They tried to change the temperature, humidity level of the air, and the proportions of the ingredients used to make the bubbles. They discovered they could create bubbles that were up to 8 degrees cooler than the air around them. They also found that varying the amount of glycerol affected the temperature of the bubbles formed; the more glycerol there is, the higher the temperature.
The researchers think the cooler films may be the result of evaporation as bubbles form. They also noted that over the “life” of the bubbles, their film gradually heats up, eventually reaching the temperature of the surrounding air. They think the large temperature difference they found in some bubbles could affect their stability.
During further research, the authors hope to understand how the phenomenon they discovered can be used.
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