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Dimensional analysis
a gram
Tons and kilometres cannot be converted. They measure different physical properties.
Grams are one unit in which weight can be measured.
Millimeters is a measure of length while a cup is of volume. Try changing one unit to another of the same measure, i.e., volume to volume like liters and a cup.
conversion
That means that if you have a measurement in one unit, you convert it to another unit. For example, if a measurement is given in millimeters, you may need to convert it to meters.
You don't really "convert a unit of measurement"; you convert from one unit to another. The two - "from" and "to" are always required.
Dimensional analysis
a gram
A litre is one, a gallon is another.
the ratio at which a unit of the currency of one country can be exchanged for that of Another Country. (www.dictionary.com)
lightyear
kilometers
move the decimal point the the correct spot
A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.
An increase in the value of one currency relative to another currency. Appreciation occurs when, because of a change in exchange rates; a unit of one currency buys more units of another currency.