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23 hours ago · This discovery overturned what he described as "one of the earliest and universally received maxims of electricity", that only water and metals could conduct electricity. This and other experiments on the electrical properties of materials and on the electrical effects of chemical transformations demonstrated Priestley's early and ongoing interest in the relationship between chemical ...
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23 hours ago · The encounter made Humboldt think more deeply about electricity and magnetism, typical of his ability to extrapolate from an observation to more general principles. [63] Humboldt returned to the incident in several of his later writings, including his travelogue Personal Narrative (1814–29), Views of Nature (1807), and Aspects of Nature (1849).
23 hours ago · Wind power is the use of wind energy to generate useful work. Historically, wind power was used by sails, windmills and windpumps, but today it is mostly used to generate electricity. This article deals only with wind power for electricity generation. Today, wind power is generated almost completely with wind turbines, generally grouped into ...
23 hours ago · Thorium is a weakly radioactive light silver metal which tarnishes olive gray when it is exposed to air, forming thorium dioxide; it is moderately soft and malleable and has a high melting point. Thorium is an electropositive actinide whose chemistry is dominated by the +4 oxidation state; it is quite reactive and can ignite in air when finely ...
23 hours ago · Krypton is used in high-performance light bulbs, which have higher color temperatures and greater efficiency, because it reduces the rate of evaporation of the filament more than argon; halogen lamps, in particular, use krypton mixed with small amounts of compounds of iodine or bromine. [78]
23 hours ago · The Three Gorges Dam in Central China is the world's largest power-producing facility of any kind. Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies 14% of the world's electricity, almost 4,210 TWh in 2023, [1] which is more than all other renewable sources combined and also ...
23 hours ago · The first excimer laser design used a xenon dimer molecule (Xe 2) as the lasing medium, [23] and the earliest laser designs used xenon flash lamps as pumps. [24] Xenon is also used to search for hypothetical weakly interacting massive particles [ 25 ] and as a propellant for ion thrusters in spacecraft.
