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It's for determining the number of significant figures. Think of the U.S. in a map. The Atlantic Ocean is to the right. Pacific to left.

If a decimal is present, start counting from the "Pacific" (left).

If absent, count from "Atlantic" (right).

So, what are we counting? We count the first nonzero digit we encounter; and all subsequent digits.

E.G.: 432.30 gram has 5 sig figs.

6,000 has 1 sig fig.

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Q: What is Pacific-Atlantic Rule for significant figures?
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