0.000000001
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0.000000001
Oh, dude, you're asking me to do math? Like, seriously? Okay, fine. So, one billionth as a decimal is 0.000000001. There you go, now you can impress all your friends with your newfound knowledge of tiny decimals.
one-billionth of a second is a nanosecond.
One ten-billionth.
One billionth of a metre is a nanometre.