HP Forum Archive 21

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HP Prime Fundamental Constants Message #1 Posted by Timothy Roche on 3 Dec 2013, 6:19 p.m. All the fundamental constants in the updated software revision (5447) are correct to 12 significant digits (almost). Minor quibble: f0 (the 1eV-photon frequency) is incorrectly rounded up in the constants library. f0=c/(lambda0)=c*e/h=2.417 989 349 604 730 E14 where c = speed of light in a vacuum e = the magnitude of electrical charge on an electron h = Planck constant lambda0 = 1eV-photon wavelength So the value, rounded to 12 significant digits, should be: f0= 241 798 934 960 000 Thank you for the software revision and updating the constants, Tim

Re: HP Prime Fundamental Constants Message #2 Posted by Tim Wessman on 3 Dec 2013, 6:28 p.m., in response to message #1 by Timothy Roche Picky, picky, picky. :-P The units now show when you click VALUE. The only value that still isn't in "base" units is the value for StdP, but I've never once seen that given in anything but kPa. Thoughts? Any other constants you think should be added? TW Edited: 3 Dec 2013, 6:29 p.m.

Re: HP Prime Fundamental Constants Message #3 Posted by Paul Dale on 3 Dec 2013, 6:35 p.m., in response to message #2 by Tim Wessman This constant definitely should be there :) - Pauli

Re: HP Prime Fundamental Constants Message #4 Posted by Timothy Roche on 3 Dec 2013, 7:02 p.m., in response to message #2 by Tim Wessman I believe that most people using standard pressure will recognize its magnitude and the implied units if they are not displayed (with Value selected). Students in chemistry and physics will catch on quickly that the pressure units are kilopascals, too. The addition of the displayed units when Value is un-selected is most welcome. If you are looking for more constants, the relative atomic mass of each element would be most convenient for student and professional alike. These may be easily found at the webelements page, which is authoritative and up-to-date with the latest IUPAC values. Tim Edited: 3 Dec 2013, 7:17 p.m.

Re: HP Prime Fundamental Constants Message #5 Posted by Cristian Arezzini on 4 Dec 2013, 4:39 a.m., in response to message #2 by Tim Wessman Quote: Any other constants you think should be added? TW weeeell... since you asked... :P I quite often use some astronomical constants like Earth, Moon, and Sun mass and diameter, plus the gravitational constants. I realize it's quite a niche field, but hey, you asked! :) A long time ago I also made the same request to the WP34s team, and they complied... ;) Or... what about adding a "user defined" item to the constant menus where anyone can store the constants we use more commonly (including their units of course)? Cristian

Re: HP Prime Fundamental Constants Message #6 Posted by CR Haeger on 4 Dec 2013, 6:14 a.m., in response to message #5 by Cristian Arezzini Yes please - a separate selection of user defined would be handy.

Re: HP Prime Fundamental Constants Message #7 Posted by Walter B on 4 Dec 2013, 6:27 a.m., in response to message #5 by Cristian Arezzini Quote: I quite often use some astronomical constants like Earth, Moon, and Sun mass and diameter, plus the gravitational constants. I realize it's quite a niche field, but hey, you asked! :) A long time ago I also made the same request to the WP34s team, and they complied... ;) I don't mind if Tim buys a WP 34S manual ... d;-)

Re: HP Prime Fundamental Constants Message #8 Posted by Walter B on 4 Dec 2013, 4:49 p.m., in response to message #1 by Timothy Roche Personally, I wouldn't have chosen f0 and [lambda]0 to participate in this rather limited set of physical constants. Other constants come into my mind instead. YMMV d:-I

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