In 1856 Eunice Newton Foote first demonstrated in a scientific experiment the heat-trapping properties of carbon-dioxide and other greenhouse gases.
) in Goshen, she later became interested, together with her husband Elisha Foote, in physics. She published just two scientific papers in 1856 and 1857, but the first paper is noteworthy as it predates by three years Tyndall's conclusions.
The article describes an experiment with glass tubes containing air samples with different densities and varying water vapor and carbon gas levels, and a mercury thermometer to record temperature changes. Foote recognizes the role of air density in explaining the decrease of temperature at higher elevations, like experienced on a mountain's summit where air density is lower.
Based on her observations, she correctly concluded that varying concentration of gases like water vapor and carbon-dioxide in Earth's atmosphere could explain changes in Earth's temperature. “An atmosphere of that gas would give to our earth a high temperature; and if as some suppose, at one period of its history the air had mixed with it a larger proportion than at present, an increased temperature from its own action as well as from increased weight must have necessarily resulted.”
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