Physical quantities.
Physical quantity.
A quantity is defined from a factor and a unit.
Add two quantities.
If the other object is not a quantity, raise an error. Two quantities can be added only if they have the same unit: so we convert first the other quantity to the same unit and, if it succedded, then we add the factors.
Convert the quantity to a unit.
Convert the quantity to another (compatible) unit.
Units and unit systems
Category Theory Module
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