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Comment by dmd

3 days ago

Er - you know a magnetron doesn’t actually spin, right?

Ackshully that's not strictly true. Some (very) old models did not rotate the food, but instead rotated the microwave emitter in the top of the cavity.

As a first approximation of referring to magnetic fields and their flux and inertia, "spins" is still a useful and common word for that. But yes, not necessarily the best technically correct word.