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The smallest one - but it makes sense only if you have means of measuring to that precision. Also, more precise is not the same as more appropriate.

For example, a micrometre is more precise than a kilometre (by a factor of one billion) but if it makes no sense at all to measure the distance between two cities in micrometres!

Or, a microgram is more precise than a kilogram (again by a factor of a billion), but it makes no sense to measure my mass in micrograms. My mass will increase by more than that after I've had a mug of coffee!

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12y ago
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Q: Which unit of measure is more precise?
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