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Topic: About Atomic Weight  (Read 4751 times)

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Offline Winga

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About Atomic Weight
« on: February 05, 2005, 01:47:01 AM »
e.g. Hydrogen
Its atomic weight according to IUPAC is 1.00794(7).
Is the digit inside the brackets an uncertainty?
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dexangeles

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Re:About Atomic Weight
« Reply #1 on: February 05, 2005, 02:06:56 AM »
good question, but i highly doubt it, too big of an uncertainty, maybe the last sig fig???

lets see what the mods say, im curious now too  ???
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Offline Mitch

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Re:About Atomic Weight
« Reply #2 on: February 05, 2005, 04:50:17 AM »
It means it was measured to be 1.007947, but the last 7 is not known with exact accuracy so it is placed in parenthesis.
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Offline Winga

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Re:About Atomic Weight
« Reply #3 on: February 05, 2005, 12:39:07 PM »
So, should I take the digit inside the brackets when doing a calculation that I want to have the most accurate calculation?
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