十亿分之一 (shí yì fēn) — one billionth (1/1,000,000,000)

Definition

Literally 'one part in a billion' (1/1,000,000,000). Used in science and statistics for extremely tiny quantities or probabilities — not for everyday measurement.

numeral

one billionth (1/1,000,000,000)

Examples

十亿分之一。
Zhè zhǒng huà xué wù zhì de nóng dù zhǐ yǒu shí yì fēn.
The concentration of this chemical is only one billionth.
十亿分之一。
Tā zhōng cǎi piào de gài lǜ bú dào shí yì fēn.
His chance of winning the lottery is less than one in a billion.
十亿分之一。
Kē xué jiā cè liáng dào shí yì fēn miǎo de shí jiān biàn huà.
Scientists measured a time change of one billionth of a second.

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