ppb - parts per billion
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A symbol that represents parts per billion, or parts per billion. It is used to indicate trace amounts of pollutants, with 1 ppb indicating a concentration of one part in a billion, or 10 -9 (in the UK it is called one part in a trillion, or 10 -12 ). Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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10億分率を表わす記号で，part per billionの略。公害物質の微量含有率などを示すのに用いられ，1ppbは含有率が 10億分の1すなわち 10-9 (イギリスでは1兆分の1，すなわち 10-12 ) であることを示す。
出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報 |
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