Scientists from the University of Paris-Saclay made an unusual discovery that concerns bubbles. It turned out that in some cases, the film surrounding the bubbles can be eight degrees Celsius colder than the surrounding air, according to Science Alert..

The publication notes that in fact, bubbles surround us everywhere: in the washing machine, in the foam of beer, on the crest of a wave, in saliva between the teeth and, of course, soap bubbles.. And this means that the physics of bubbles is important for understanding the environment..

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In the study, the scientists used a mixture of dishwashing liquid, water, and glycerin, with variations on the final substance, which was used to fine-tune the life and evaporation rate of the bubbles..

These bubbles were examined under different conditions of temperature and humidity.. In some cases, the difference between the soap suds and the ambient air was significant - eight degrees Celsius..

Scientists already knew that soap films lose liquid through evaporation in an attempt to release energy.. But it was assumed that this temperature corresponds to the environment.

“Experimentally, we have observed that the temperature first decreases and then rises until the ambient temperature is reached again.. We reported that the magnitude of the cooling effect depends on both the relative humidity and the initial concentration of glycerol, decreasing the values \u200b\u200bof these two parameters leads to a stronger effect,” the researchers write..

These scientists' findings could be useful in areas where bubble stability could be critical.. The temperature difference between the bubble film and the surrounding surface can affect these calculations..