him for medical school, but because of lacked of money, his family discourage him and did not feel he was suited for a physician. In 1793 Dalton moved to Manchester to tutor at New College. He joined the Manchester Literary and Philosophical Society. It was there at New College in Manchester were Dalton published his first book in 1793, entitled Meteorological Observation and Essays.In his first book he said that each gas exists and its independently and purely physically, rather than chemically. However his first published attracted little attention.Dalton's most important contribution to science, was his atomic theory that "matter is composed of atoms differing weights and combine in simple ratios by weight". In 1808 Dalton published a third book entitled A New System of Chemical Philosophy. In this book he listed the atomic weights of a number of known elements related to the weight of hydrogen, although his weight were not precisely accurate they did in fact form the basis for the modern periodic table of the elements. Dalton came to this atomic theory by studying the physical properties of atmospheric air and other gases. While in the quest he discovered the law of partial pressures of mixed gases which became known as Dalton's Law. Dalton's Law stated that the total pressure put out by a mixture of gases would pout out if it alone occupied the whole volume. Dalton's law applies only to ideal gases. But it might hold closely enough for real gases. For example, I f water was put into a closed container of dry air, some water will evaporate, and the pressure inside the container will increase by an amount approximately equal to the partial pressure of the water vapor. In 1804 and 1809 Dalton was invited to teach courses n The Royal Institution in London. In 1822 he was made a fellow of the Royal Society and was awarded the society's gold medal in 1826. Here are some laws of importance. First- matter is made of atoms. Second- atom...
