the atmospheric concentration of carbon dioxide increased from 278 ppm in 1790 to 383 ppm in 2007. what is the approximate percent increase in carbon dioxide concentration from 1790 to 2007?

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.