Bob Yirka is a research scientist at Phys.org.
The film that makes up soap bubbles is cooler than the air around it. The group described their experiments with soap bubbles in their paper.
Beer glasses, clothes, and dish washers are just some of the places where bubbles exist. They can be found in the space between human teeth. Research has focused on controlling bubbles during industrial processes. According to the researchers in Orsay, their films are cooler than the air around them, which is a new discovery.
The researchers used equipment that allowed them to measure the temperature of the bubble film and found that it was cooler than the ambient air.
The researchers used dish soap, water, and glycerol to make bubbles. The team focused on learning more after they discovered a temperature difference. The temperature of the air, the humidity level, and the proportions of the ingredients used to make bubbles were all changed. The bubbles they made were up to 8 degrees cooler than the air around them. Changing the amount of glycerol made a difference in the temperature of the bubbles.
The cooler films could be caused by the bubbles forming. As the bubbles persisted, their films grew warmer and eventually matched the ambient air temperature.
The Measurement of the Temperature Decrease in Evaporating Soap Films was written by Franois Boulogne. There is a book titled "PhysRevLett.129.268001". Arxiv.org/abs is where you can find it.
Journal information: Physical Review Letters
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