In the metric (or SI) system, where units are related to one another by powers of 10, scientific notation makes conversions incredibly simple. However, if you are unfortunate enough to live in a country which still uses the Imperial system (or a variant) scientific notation is of hardly any help: converting 3.5*10^3 yards to miles is a difficult calculation.
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Scientific notation is scientific notation - whether it is used for metric units, Imperial units or simply for numbers.
By changing the measurement units to a nanogram you would not require scientific notation. 1 nanogram = 1*10-9 gram or 1*10-12 kilogram
Conversion factors (equivalence between two measures) are used to convert between units
In general, they are not.If you are thinking of the distance from the earth to the sun, then there are more convenient units. Even so, using scientific notation, that is a trivial problem.In general, they are not.If you are thinking of the distance from the earth to the sun, then there are more convenient units. Even so, using scientific notation, that is a trivial problem.In general, they are not.If you are thinking of the distance from the earth to the sun, then there are more convenient units. Even so, using scientific notation, that is a trivial problem.In general, they are not.If you are thinking of the distance from the earth to the sun, then there are more convenient units. Even so, using scientific notation, that is a trivial problem.
Density = Mass/Volume. Conversion between units will depend on what the two units are.