Q8.1.1The most well-determined physical constants
By changing a single line in the program of Example E8.1, output the 10 most accurately known constants (excluding those set to their values by definition).
Show solution
Change the line
for rec in constants[:-10]:
to:
for rec in constants[constants['rel_unc'] > 0][:10]:
and the format specifier in the output line to ':g' (since the uncertainties are less than 1 ppm).
1.79792e-07 ppm: electron g factor = -2.00232
1.79792e-07 ppm: electron mag. mom. to Bohr magneton ratio = -1.00116
1.06719e-06 ppm: kilogram-hartree relationship = 2.06149e+34 E_h
1.07488e-06 ppm: atomic unit of time = 2.41888e-17 s
1.07672e-06 ppm: hartree-kelvin relationship = 315775 K
1.08702e-06 ppm: atomic unit of current = 0.00662362 A
1.08846e-06 ppm: electron volt-hartree relationship = 0.0367493 E_h
1.08994e-06 ppm: joule-hartree relationship = 2.29371e+17 E_h
1.09259e-06 ppm: hartree-kilogram relationship = 4.85087e-35 kg
1.09352e-06 ppm: Rydberg constant = 1.09737e+07 m^-1
The most accurately known constant is the electron \(g\)-factor.