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A tamp is a device used to compact or flatten an aggregate or another powdered or granular material, typically to make it resistant to further compression or simply to increase its density. ==Examples== * Small, handheld tampers are used to compress ground coffee into a puck to prepare espresso. * Manual or powered tampers compact gravel before laying a concrete or brick patio or walkway so that the underlying gravel layer does not settle over time, or compress the fill in a utility trench as seen in the illustration. * Self-propelled, mechanised ballast tampers, which compact the ballast underneath rail tracks. * Preparing some firearms and artillery pieces for firing may involve tamping the charge, such as explosive material or a projectile, into the barrel. * A fireplace can be tamped with a poker or similar tool to compress the material being burned (wood, coal, peat etc...). This improves the heat/burning efficiency, by reducing the volume of burning material that is exposed to airflow. This is often confused with damping - which involves reducing the intensity of the burn by restricting the flue or by the use of any fire retarding material such as water. 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「tamp」の詳細全文を読む スポンサード リンク
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