Make conversions involving multiple units.

[amine-aboufirass]

Is it possible to convert from, say m3/s to L/day using this library?

[angularsen]

Yes, if there are defined units with those abbreviations, then you can.

VolumeFlow.Parse("5 m³/s").ToUnit(VolumeFlow.ParseUnit("L/day"))

Note that m3/s is not defined, but m³/s is. If needed, you can add the m3/s unit abbreviation too.
https://github.com/angularsen/UnitsNet/wiki/Adding-a-New-Unit