First of all, the metric unit IS the standard unit. It is the international standard, and only a few countries don't use it yet.
It is not any more accurate - the inch, for example, is defined on the basis of the meter, so it is just as accurate. However, the metric system can help avoid confusions - for example, different countries used to have, and in part still have, different definitions for the pound.
The main advantage of the metric system lies in its standardization - people all over the world using the SAME measurements.
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Than all people will have to use metric measurement. Schools will have to provide special courses for teaching metrics, metric tools for measuring will have to be bought, and everything will have to be relabeled. * * * * * But if all people use the metric system then you will have standard measurements! The question is about what will happen if you don't.
The more accurate number - is 1.005 - as it is accurate to more decimal places than the other examples.
Depends on if by 'customary' you're referring to a short ton or a long ton. A short ton is less than a metric ton; a long ton is more than a metric ton.
Millimeters are smaller so if a measurement is given in mm it is likely to be more accurate than a measurement given in cm. However, it's important to note that neither mm nor cm is inherently more accurate.
A metric ton is a unit of weight, whereas a cubic meter is a unit of volume, so there is no conversion. Think of it this way: A metric ton of styrofoam will occupy far more volume than a metric ton of lead or tungsten. For water at 4C and 760mmHg 1 liter equals 1 kilogram, although this is no longer the SI definition of one liter. So for water at ideal conditions 1 metric ton = 1 cubic meter. Many industries dealing with fluids at or near the density of water use this equivalency as a shortcut even if it is not quite accurate.