![]() ![]() The metric system was passed by law in France on August 1, 1793. The centimeter was defined as one-hundredth of a meter the kilometer was defined as 1000 meters. The word meter comes from the Greek word metron, which means measure. The committee consisted of the mathematicians Jean Charles de Borda (1733-1799), Joseph-Louis Comte de Lagrange (1736-1813), Pierre-Simon Laplace (1749-1827), Gaspard Monge (1746 -1818), and Marie Jean Antoine Nicholas Caritat, the Marquis de Condorcet (1743-1794) A committeee from the Academy used a decimal system and defined the meter to be one 10-millionths of the distance from the equator to the Earth’s Pole (that is, the Earth’s circumference would be equal to 40 million meters). In 1790, the French National Assembly directed the Academy of Sciences of Paris to standardize the units of measurement. The metric system was invented in France. These batteries have an alkaline electrolyte, and not an acid.įor more information on the battery, click here. The dry cell battery was developed in the 1870s-1870s by Georges Leclanche of France, who used an electrolyte in the form of a paste.Įdison batteries (also called alkaline batteries) are an improved type of storage battery developed by Thomas Edison. ![]() The dry cell is a an improved voltaic cell with a cylindrical zinc shell (the zinc acts as both the cathode and the container) that is lined with an ammonium chloride (the electrolyte) saturated material (and not a liquid). ![]() In 1859, the French physicist Gaston Plante (1834-1889) invented a battery made from two lead plates joined by a wire and immersed in a sulfuric acid electrolyte this was the first storage battery. Storage batteries are lead-based batteries that can be recharged. Batteries are used to power many devices and make the spark that starts a gasoline engine.Īlessandro Volta was an Italian physicist invented the first chemical battery in 1800. This unit consisting of two electrodes is called a cell (often called a voltaic cell or pile). An electrical circuit runs between these two electrodes, going through a chemical called an electrolyte (which can be either liquid or solid). Each battery has two electrodes, an anode (the positive end) and a cathode (the negative end). A battery is a device that converts chemical energy into electrical energy. ![]()
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