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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Longest-lasting light bulbs ： ウィキペディア英語版 Longest-lasting light bulbs This is a list of the longest lasting incandescent light bulbs. ==Longest-lasting light bulb== The world's longest lasting light bulb is the Centennial Light located at 4550 East Avenue, Livermore, California. It is maintained by the Livermore-Pleasanton Fire Department. The fire department claims that the bulb is at least 114 years old (installed 1901) and has only been turned off a handful of times. The bulb has been noted by The Guinness Book of World Records, Ripley's Believe It or Not!, and General Electric as being the world's longest-lasting light bulb. While it might seem astonishing that so many longest-lasting light bulbs have been so infrequently turned off, this is the precise reason for their longevity. Most of the wear and tear that leads to burnouts in incandescent light bulbs is caused by turning them on and off, not by burning them. Each time the bulb is turned on and off, the filament is heated and cooled. This causes the material of the filament to expand and contract, in turn causing tiny stress cracks to develop. The more the light is turned on and off, the larger these cracks grow, until eventually the filament breaks at some point, causing the light to burn out. Another reason for the longevity of bulbs is the size and quality of the filament. 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「Longest-lasting light bulbs」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.