Microwaving Grapes Makes Plasma

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Published Feb 4, 2026

A bisected grape in the microwave makes plasma. But how does it work? A grape is the right size and refractive index to trap microwaves inside it. When you place two (or two halves) close together the fields interact with each other creating a maximum of electromagnetic energy where they touch. This creates heating, sparks, and plasma, which is further fed with energy directly by the microwaves.

Huge thanks to Hamza Khattak, Prof. Pablo Bianucci and Prof. Aaron Slepkov (unavailable for the call) for chatting to me and helping me understand the physics of this cool phenomenon.

Linking plasma formation in grapes to microwave resonances of aqueous dimers
https://www.pnas.org/cgi/doi/10.1073/pnas.1818350116

Special thanks to Patreon supporters:
Donal Botkin, James M Nicholson, Michael Krugman, Nathan Hansen, Ron Neal, Stan Presolski, Terrance Shepherd

Thanks also to Steve Bosi, my original plasma collaborator.

Animations by Alan Chamberlain

Music from http://epidemicsound.com "Seaweed"

Category: Trạm Tri Thức
Tags: veritasium, science, physics

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Microwaving Grapes Makes Plasma

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