| 翻訳と辞書 | Water-reactive| Water-reactive  : ウィキペディア英語版 | 
 
 A water-reactive substance is one that spontaneously undergoes a chemical reaction with water.  Notable examples include alkali metals sodium through caesium.
 Water-reactive substances are classified as R2 under the UN classification system and as Hazard 4.3 by the United States Department of Transportation.
 Some water-reactive substances are also pyrophoric.
 Some of the metals that are reactive with water are the alkali metals: lithium, sodium, potassium, rubidium, and caesium. These metals are usually stored in containers with oil so that, if any water is brought into the container, it and the oil will separate, protecting the metal.
 == Further reading ==
 
 * (【引用サイトリンク】title=The MSDS HyperGlossary: Water Reactive  )
 
 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』
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