Something strange is happening to the temperature around newly formed bubbles

(ORDO NEWS) — When you stop and think about bubbles, you realize that they are everywhere: in the dishwasher, on the cap of beer, on the crests of waves, in saliva between teeth and, of course, in bubbles. gun toys.

This means that bubble physics is important in all scenarios. With this in mind, researchers at the University of Paris-Saclay in France have made an intriguing discovery about the film surrounding the bubbles.

This film can withstand temperatures up to 8°C (14.4°F) in some cases. ) is colder than the environment around it, the researchers say.

The results are based on previous research on how temperature changes can cause thinning and evaporation of the liquid film.

“While this effect is often considered in droplet evaporation studies, to our knowledge, the significance of refrigeration-induced evaporation is not mentioned in the literature on soap films and foams,” the researchers write in a published paper.

To get a closer look at these soap films and foams bubbles, essentially the team put together a mixture of dishwashing liquid, water, and glycerin, with variations on the final substance used to fine-tune the life and evaporation rate of the bubbles.

These bubbles have been tested in various temperature and humidity conditions. In some cases, the difference between the soap film and the surrounding air was significant, with a maximum temperature of 8°C.

Although soap films were already known to lose liquid through evaporation on energy (just as we do when we sweat to cool ourselves), these films were assumed to be at ambient temperatures.

“Experimentally, we observed that the temperature first decreases and then rises until the ambient temperature is reached again,” the researchers write.

“We reported that the magnitude of the cooling effect depends on both the relative humidity and the initial concentration of glycerol, decreasing the values ​​of these two parameters leads to stronger effects.”

One way this research could be useful is in industrial processes where controlling bubble stability is vital. These calculations will be affected by temperature differences between the bubble wrap and the outside world.

The researchers say that soap film viscosity and surface tension are two properties likely to be affected by the temperature gap they found; indeed, soap objects may not have a uniform thermal field over the entire surface.

However, this is the first study of its kind, and much more research is needed before scientists can say exactly how temperature changes can affect the film that makes up the bubble.

“We propose a model describing the temperature drop of soap films after their formation, which is quantitatively consistent with our experiments,” the researchers write.

“We emphasize that this cooling effect is of great importance and should be carefully considered in future studies of soap film dynamics.”

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