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.

thermochem.codata.value(key)[source]

value indexed by key

thermochem.codata.unit(key)[source]

unit indexed by key

thermochem.codata.precision(key)[source]

relative precision indexed by key

thermochem.codata.find(sub)[source]

list all keys containing the string sub