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Physics, Astronomy & Cosmology / Why is a hot shiny surface such a poor emitter of infra red
« on: 06/11/2009 18:19:26 »
The cup will never be warmer than the kettle at best they'll equalise and the kettle is being warmed by electricity so it's entirely losing heat and no perpetual motion to worry about.
The shiny surface also has a lower surface area than a scratched surface so it loses less heat.
The shiny surface also has a lower surface area than a scratched surface so it loses less heat.