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-20 Scientists
-10 Inventions -
The real date of the even is 460 B.C.
His ideas was that matter is composed of empty space through which atoms move. -
He used this experiment to help himself come up with the Law of Conservation. The law states that matter cannot be made or destroyed. He also hints at the rearrangement of matter in reactions. Matter rearranged, but never disappeared.
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Came up with the Law of Definite Proportions which states that a compound is composed of exact proportions of elements by mass regardless of how the compound was created.
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Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
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Avogadro's molecular theory related gas densities to molecular weights, explained reacting proportions by volume in terms of molecular ratios and compositions, and suggested methods for determining both molecular weights and compositions.
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The device was made with the goal of helping legislators in the US Congress record their votes in a quicker fashion than the voice vote system.
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Edison invented the ancestor of the tattoo gun -- the pneumatic stencil pen. This electric pen, which Edison patented in 1876, used a rod tipped with a steel needle to perforate paper for printing purposes.
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Considered to be the first great Thomas Edison invention, and his life-long favorite, the phonograph would record the spoken voice and play it back.
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In 1877, Edison developed the carbon transmitter, a device that improved the audibility of the telephone by making it possible to transmit voices at higher volume and with more clarity.
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Link Discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass.
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Probably the biggest financial failure of Edison's career was the magnetic ore-separator. The idea, which Edison's laboratory experimented with during the 1880s and 1890s, was to use magnets to separate iron ore from unusable lower-grade ores.
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In 1881, Edison filed for a patent for a method to preserve fruits, vegetables or other organic substances in a glass vessel. The vessel was filled with the items to be preserved, and then all the air was sucked from it with an air pump. The vessel tube was sealed with another piece of glass.
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Edison solved this problem by patenting the Webermeter in 1881. The Webermeter contained two or four electrolytic cells with zinc at both electrodes and a zinc sulfate solution. The zinc transferred from one electrode to the other at a set rate as electricity was used. The meter reader removed the electrolytic cells at each reading for weighing, replacing them with new ones.
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https://www.youtube.com/watch?v=b03IW4fgl30 While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
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Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram. Studied "canal rays" and found they were associated with the proton H + .
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Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.
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Edison believed cars would be powered by electricity, and in 1899 he began to develop an alkaline storage battery that would power them.
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Postulated a "Saturnian" model of the atom with flat rings of electrons revolving around a positively charged particle.
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https://www.youtube.com/watch?v=hW7DW9NIO9M Published the famous equation E=mc 2
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Oil drop experiment determined the charge (e=1.602 x 10 -19 coulomb) and the mass (m = 9.11 x 10 -28 gram) of an electron.
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https://www.youtube.com/watch?v=45TGJRBFLNc Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm) gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus.
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Made with air-impregnated foam to keep the weight at only one-and-a-half times that of wooden furniture, Edison's line of concrete furnishings would be sanded and smoothed into a mirror-like finish or stained to look like wood grain.
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Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass.
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Taking the idea of the telephone and the telegraph a bit further, Edison announced in October of 1920 that he was working on a machine to open the lines of communication with the spirit world. Even though Edison died before it came out.
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Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons.
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Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality. Supported Einstein.
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Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy: you can not know both the position and velocity of a particle.
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Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.
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https://www.youtube.com/watch?v=73JJRLd8Yio Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron.
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Aristotle promoted the idea that the universe was made from Earth, air, fire, and water. He did not believe in the atom theory.
