Have you ever been walking around with a full cup of coffee, only to have it suddenly jump out of your hands and onto the floor? It may seem like a random occurrence, but a new study has found that the phenomenon of coffee splashing out of a cup is actually due to static electricity! This intense static charge builds up between the cup and the liquid, leading to a powerful repulsive force that can cause the liquid to suddenly leap out of the cup. The research team concluded that this knowledge could be used to design better cups and lids to prevent this issue from happening.

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source: Phys.org