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QuantityMagnitude @ Quantity[3, "Euros"] Information[Quantity[3, "Euros"], "Magnitude"] Normal @ Quantity[3, "Perents"] Thanks to @BobHanlon for pointing out to QuantityMagnitude. From documentation of Quantity: For purely numeric units, such as percents, Normal[expr] converts a Quantity object to an ordinary number. ...


You just need to add this code at your note book: << PhysicalConstants` And then you can easily get numerical values for physical constants by calling them like this: e = ElectronCharge


pl = QuantityMagnitude[Entity["PhysicalConstant", "PlanckLength"]["Value"]] 1.6163*10^-35

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