Raindrops Carry Tiny Lightning Bolts, Study Finds

11:02 PM ETDeveloping

Science Desk

In Short: A new study reveals that raindrops carry electrical charges large enough to damage surfaces, potentially explaining why cars corrode under constant rain.

Raindrops are not just water; they are tiny lightning bolts, according to a new study. Researchers from the Max Planck Institute for Polymer Research in Mainz, Germany, have shown that water drops routinely arrive at a surface carrying an electrical charge large enough to punch through an insulating coating. This finding explains why cars corrode under constant rain, as the electrical charge in raindrops can cause corrosion even without the presence of salts and acids.

The study, led by Zhongyuan Ni, Rüdiger Berger, and Hans-Jürgen Butt, used a technique called intracellular recording to measure the electrical responses of individual photoreceptors in four bee species and both sexes of each. The researchers found that the electrical charge in raindrops can disrupt the protective coatings on surfaces, leading to corrosion.

The standard explanation for why rain causes corrosion is that water carries dissolved salts and acids to a surface, constant drumming of raindrops abrades whatever protective coating is on it, and oxygen does the rest. However, the new study suggests that the electrical charge in raindrops is a significant factor in the corrosion process.

The findings of the study were published in the journal PLoS ONE, providing a new understanding of the mechanisms behind rain-induced corrosion. The study's lead author, Zhongyuan Ni, said, 'Water drops routinely arrive at a surface carrying an electrical charge large enough to punch through an insulating coating.

The study's implications extend beyond just corrosion. It highlights the importance of understanding the electrical properties of rain and how they interact with surfaces. This knowledge could lead to the development of new materials and coatings that are more resistant to the damaging effects of rain.

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