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docs: "Many shades of the same unit" extended with a note about the derived units order

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Mateusz Pusz
2024-10-16 17:18:19 +02:00
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docs/users_guide/framework_basics/systems_of_units.md
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@ -92,6 +92,18 @@ prints:
All of the above quantities are equivalent and mean exactly the same. All of the above quantities are equivalent and mean exactly the same.
!!! note
The above code example may give the impression that the order of components in a derived
unit is determined by the multiplication order. This is not the case. As stated in
[Simplifying the resulting expression templates](interface_introduction.md#simplifying-the-resulting-expression-templates),
to be able to reason about and simplify units, the library needs to order them in an
appropriate order. This will affect the order of components in a resulting type and
text output.
Please refer to [our FAQ](../../getting_started/faq.md#why-derived-units-order-is-not-preserved-from-the-multiplication)
for more information.
## Constraining a derived unit to work only with a specific derived quantity ## Constraining a derived unit to work only with a specific derived quantity