Guillaume Amontons

Guillaume Amontons

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Guillaume Amontons (1663-1705) was an experimentalist who devoted himself to the improvement of instruments employed in physical experiments, particularly Pendant the barometer, and the thermometer.Of special note are a folded barometer, a cisternless barometer to be used at sea, and a hygrometer of his invention.He experimented with an air-thermometer and pointed out that the extreme cold of such a thermometer would be that which reduced the spring of the air (pressure) to nothing, thus being the first to recognize that the use of air as a thermometric substance led Ceramic Plant Pot to the inference of the existence of a zero of temperature.During his studies on the behavior of air he established that at constant volume the pressure varied inversely to the temperature.He devised an external-combustion machine and was among the first to study problems due to friction in machines (Amontons-Coulomb laws).