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An image from John Dalton's A New System of Chemical Philosophy, the first modern explanation of atomic theory.. This timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry, defined as the scientific study of the composition of matter and of its interactions.
1789: Antoine Lavoisier: law of conservation of mass, basis for chemistry, and the beginning of modern chemistry. 1796: Georges Cuvier: Establishes extinction as a fact. 1796: Edward Jenner: smallpox historical accounting. 1796: Hanaoka Seishū: develops general anaesthesia. 1800: Alessandro Volta: discovers electrochemical series and invents ...
The most celebrated discoveries of Scottish chemist William Ramsay were made in inorganic chemistry. Ramsay was intrigued by the British physicist John Strutt, 3rd Baron Rayleigh 's 1892 discovery that the atomic weight of nitrogen found in chemical compounds was lower than that of nitrogen found in the atmosphere.
In western nations, motor vehicle accidents became the greatest cause of death for young people. However, expansion of divided highways reduced the death rate. The triode tube , transistor and integrated circuit successively revolutionized electronics and computers, leading to the proliferation of the personal computer in the 1980s and cell ...
Merton believed that it is multiple discoveries, rather than unique ones, that represent the common pattern in science. [4] Merton contrasted a "multiple" with a "singleton"—a discovery that has been made uniquely by a single scientist or group of scientists working together. [5] The distinction may blur as science becomes increasingly ...
It was here, 100 years ago, that Edwin Hubble noted a light in the distance that would lead to one of science's greatest discoveries. By night, astronomers kept watch at the best telescopes on Earth.
Science & Tech. Shopping. Sports. Weather. 24/7 Help. For premium support please call: ... It led to one of the greatest discoveries in modern medicine, penicillin, the first antibiotic.
Robert Hooke, using a microscope, observes cells (1665).; Anton van Leeuwenhoek discovers microorganisms (1674–1676).; James Lind, publishes 'A Treatise of the Scurvy' which describes a controlled shipboard experiment using two identical populations but with only one variable, the consumption of citrus fruit (1753).