CODATA¶
Fundamental Physical Constants
These constants are taken from CODATA Recommended Values of the Fundamental Physical Constants: 2002. They may be found at physics.nist.gov/constants. The values are stored in the dictionary physical_constants as a tuple containing the value, the units, and the relative precision, in that order. All constants are in SI units unless otherwise stated.
Several helper functions are provided:
value(key) returns the value of the physical constant. unit(key) returns the units of the physical constant. precision(key) returns the relative precision of the physical constant. find(sub) prints out a list of keys containing the string sub.