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Hi Luis Thank you for your attempt. But it did not solve my problem. Once you evaluate it, it always works and produces the images.  The real problem is that once you quit the mathematica (kernal) and then reload the file, it has the error, which...
Hi Marco Brilliant, I used it with my variables \.b2r = Power[Quantity[((¹V)/Pi ) (3/4)], 1/3];and it gives"\.b2r =" (Quantity[1.76136*10^-23, "Meters"])Many Thanks
Hi Everyone Solved my problem. Mathematica can cope with prefixed superscripts in variable names and Greek letters (with prefixed superscripts). Need to specify units in the following form. ¹d = Quantity[6.6300 10^-34, "meters"]; and it works...