Microwave (WiFi, ovens) — 12 centimeters and an honest myth

2.45 GHz; wavelength seals at 12 cm: https://narrowhighway.com/s/d6211f4efb2518c6de145decf57f27b131a01c24ce7841853f395b7bc986c323 . The famous story — "microwave ovens use water's resonant frequency" — is FALSE as commonly told: liquid water has no sharp resonance at 2.45 GHz (its dielectric loss is broadband, peaking nearer 20 GHz at room temperature). Ovens heat by broadband dielectric loss, and 2.45 GHz was a REGULATORY choice — an ISM band set aside for unlicensed noise. WiFi lives there for the same reason: it was the free junk band, and engineering made it golden. Attributed correction, cited not sealed — the myth is empirical, but the wavelength math above is receipts.