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You should use the Physical Constants Package by using << PhysicalConstants` When you enter now PlanckConstant you directly get the Plack Constant. With PlanckConstant/(Joule Second) you geht the Planck Constant without units.


In physics Planck constant may be used as a natural unit. If you want to switch to another unit system, use UnitConvert[]. For example, you can switch to standard SI units this way: UnitConvert[Quantity[1, "PlanckConstant"], "SIBase"] Which will give you: Quantity[6.626070*10^-34, ("Kilograms" ("Meters")^2)/("Seconds")] This can be done at the end ...

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