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A water-fuelled car is an automobile that hypothetically derives its energy directly from water. Water-fuelled cars have been the subject of numerous international patents, newspaper and popular science magazine articles, local television news coverage, and websites. The claims for these devices have been found to be pseudoscience and some were found to be tied to investment frauds.〔State of New Jersey Department of Law and Public Safety (press release ), November 9, 2006〕〔 These vehicles may be claimed to produce fuel from water on board with no other energy input, or may be a hybrid claiming to derive some of its energy from water in addition to a conventional source (such as gasoline). Water is fully oxidized hydrogen. Hydrogen itself is a high-energy, flammable substance, but its useful energy is released when water is formed. Water will not burn. The process of electrolysis can split water into hydrogen and oxygen, but it takes as much energy to take apart a water molecule as was released when the hydrogen was oxidized to form water. In fact, some energy would be lost in converting water to hydrogen and then burning the hydrogen because some waste heat would always be produced in the conversions. Releasing chemical energy from water, in excess or in equal proportion to the energy required to facilitate such production, would therefore violate the first or second law of thermodynamics.〔 〕〔Professor doubts water car claims – A leading alternative fuels expert throws water on Japanese company claims that it's developed the world's first car powered by just water. Professor Theodosios Korakianitis at Queen Mary University of London says water by itself would not be enough to get your car going. () 〕〔(Guidelines for Use of Hydrogen Fuel in Commercial Vehicles. Final Report ), U.S. Department of Transportation. Federal Motor Carrier Safety Administration, November 2007, pp. 20-21〕 ==What water-fuelled cars are ''not''== A water-fuelled car is not any of the following: * Water injection which is a method for cooling the combustion chambers of engines by adding water to the incoming fuel-air mixture, allowing for greater compression ratios and reduced engine knocking (detonation). * The hydrogen car, although it often incorporates some of the same elements. To fuel a hydrogen car from water, electricity is used to generate hydrogen by electrolysis. The resulting hydrogen is an energy carrier that can power a car by reacting with oxygen from the air to create water, either through burning in a combustion engine or catalyzed to produce electricity in a fuel cell. * Hydrogen fuel enhancement, where a mixture of hydrogen and conventional hydrocarbon fuel is burned in an internal combustion engine, usually in an attempt to improve fuel economy or reduce emissions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Water-fuelled car」の詳細全文を読む スポンサード リンク
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