Scientists in Saudi Arabia have offered a new explanation for how hydrogen peroxide forms in water microdroplets produced by spraying and condensation. Led by Himanshu Mishra at the King Abdullah University of Science and Technology (Kaust), the group designed a set of experiments to show that water microdroplets are unable to produce hydrogen peroxide without the uptake and chemical transformation of ozone. In revealing the underlying mechanism of hydrogen peroxide production, they hope their work will help clarify recent speculation into this unique behaviour of water.

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