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Quantity K is metric for 1000. For units, it can also refer to Kelvin temperature. It can also refer to Kinetic energy.
A unit conversion ratio
the conversion factor merely changes the number in such a way that it fits the new units the physical quantity is not changed
The quantity (magnitude, numrical value) and the units (eg inch, metre, light year)
Nothing specifically is "done" to the variable; variables are generally used to represent either:* A quantity that is initially unknown (and should be solved for), or * A quantity that can be anything - to analyze what happens no matter what a certain value is.