Indulge me one other example of propagation of uncertainty due to units conversion:
Atomic masses are measured in unified atomic mass units, but that is not a fundamental SI mass unit (the kilogram), so there is an uncertainty that must be propagated when converting atomic masses to SI units (this comes up in calculation of molar mass). On Aug 30, 1:42 am, Chris Chiasson <[EMAIL PROTECTED]> wrote: > I keep thinking of features that would be nice for engineers/ > scientists and I wanted to write them down. > > 1. symbolic spreadsheets via open office > 2. units tracking (actually dimensions tracking - some fundamental SI > units are not dimensions, eg. moles) > 3. propagation of uncertainty (including accounting for correlation) > 4. (An idea from a feature in Mathematica v6, only better:) Ask > standards organizations to publish SAGE packages that make up to date > physics and engineering data available in SAGE: > NIST fundamental physical constants (http://physics.nist.gov/cuu/ > Constants/) > IUPAC atomic weights (http://www.iupac.org/publications/pac/2006/pdf/ > 7811x2051.pdf) > IAPWS steam properties (http://www.iapws.org/relguide/IF97.pdf) > > Two and three could interact: for instance Boltzmann's constant and > the universal gas constant differ by a factor Avogadro's constant, and > their correlation coefficient isn't 1 (or > zero):http://physics.nist.gov/cgi-bin/cuu/CCValue?r|ShowSecond=molar+gas+constant&First=k > > meh, sorry for doing a core dump on the mailing list... --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
