Each slot holds the same number of elements, which are used to construct a unit string. short and long name, numeric unit prefix (multiplier), exponent (the nominator is positive and the denominator negative) and a reference (if not required it should be NA).
shortnamehold sthe units short name (e.g. "g", "m", ...)
longnamecan hold the long name (e.g. "gram", "meter", ...)
scaleif given with a prefix, e.g. k (kilo) it will become 1000
offsetif a value needs to be added or substracted, e.g. for temperatures degree C -> K
exponentthe exponent of the unit
referencecan hold a name to what the unit relates (if it differes for the same unit, they don't calcel out)
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