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July 28, 2014

Homework Help: Energy Transfer in Natural Systems

Posted by Sydney on Friday, December 3, 2010 at 10:38pm.

If u reach into a hot oven to remove a pizza, ur arm is not burned by the hot air but would be burned if u touched the pan. Explain.

If u reached into a hot oven to remove a pizza, ur arm would not get burned by the hot air, instead it would get burned if u touched the pan because the particles of the pan are in vibration and so if u touch the it, the heat from the particles in the pan touches the colder particles of ur jand and ur hand absorbs the heat from the pan, these particles spread little and make surrounding particles of ur hand vibrate too. Thats how u can get a burn which turns out to be bigger than the point at which ur hand actually touched the pan. This is conduction. The warm air coming out of the oven would be convection.

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