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What is the difference between 2.0 m and...

What is the difference between `2.0 m` and `2.00 m`.

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They are scientifically different althouhg they seems to be same. `2.0 m` has two significant figures, and hence its precision is 0.1 part in 2, i.e, 50 ppt (part per thousand). `2.00 m` has three significant figures and its precision is 0.01 parts in 2, i.e., 5 ppt. Hence, `2.00 m` is more precise measurement than `2.0 m`.
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