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Ballast is any material used to provide stability to a vehicle or structure. It may also refer to: ==Objects== * Ballast tank, a device used on ships and submarines and other submersibles to control buoyancy and stability * Ballast weights, metallic plates used to bring auto racing vehicles up to the minimum mandated weight * Electrical ballast, used to stabilize the current flow in lamps * Sailing ballast, ship's ballast, used to weigh a ship down * Track ballast, the layer of crushed rock or gravel upon which railway track is laid * Ballast carried aboard an aircraft, for example: * * in gliding to increase speed and/or adjust the aircraft's center of gravity * * in a balloon as a buoyancy compensator * Ballast tractor, a heavy haulage road vehicle designed to pull or push heavy or exceptionally large loads 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「Ballast (disambiguation)」の詳細全文を読む スポンサード リンク
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