Question

 If an ovens temperature increases by 50 degrees Fahrenheit how many min will it take to preheat the oven 0 degrees Fahrenheit to 30 degrees Fahrenheit?

Answer 1923 and was invented by Micheal FaradayThe first refrigeration machine using vapour was invented by Oliver Evans in 1805.It was invented in 1947.
http://wiki.answers.com/Q/If_an_ovens_temperature_increases_by_50_degrees_Fahrenheit_ho...

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