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The zero at the end is significant. It indicates that the number has been rounded to the nearest hundred thousandths: it lies between 0.004295 and 0.004305 whereas if it had two sig figs it would have been rounded to the nearest ten thousandths and lie in the range (0.00425, 0.00435).

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All non-zero digits are considered significant. Trailing zeros in a number containing a decimal point are significant.

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8y ago
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Q: Why 0.00430 has three significant figures?
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