the quantum-mechanical hydrogen atom is stable. If the hydrogen atom obeyed the laws of classical mechanics, by contrast, the electron would spiral into the proton in a tiny fraction of a second ...

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Conventional quantum mechanics didn't have such transitions ... For example, the electron in a hydrogen atom attracts the proton that is the nucleus, so the effective distance between them ...

The United States' Army's National Automotive Center has awarded Quantum Fuel Systems Technologies Worldwide with the task of building a hydrogen-powered Ford Escape Hybrid for its use.