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!
Chat with our AI personalities
foot is the most precise way to measure any unit
Milligrams.
A millilitre is more precise.A millilitre is more precise.A millilitre is more precise.A millilitre is more precise.
Both are units of measure. Neither is more 'precise'. The precision is to do with the accuracy of the measurement taken and not by the units used.
A kilometre. A megametre may be more appropriate but it is not a unit that is used much.