Re: Accessing and using built-in constants in Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg86546] Re: [mg86463] Accessing and using built-in constants in Mathematica
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 13 Mar 2008 04:34:56 -0500 (EST)
- Reply-to: hanlonr at cox.net
Needs["PhysicalConstants`"]; SpeedOfLight (299792458*Meter)/Second PlanckConstant 6.62606896*^-34*Joule*Second Needs["Units`"]; InputForm[elementatomicW = ElementData["C", "AtomicWeight"]] 12.0107`6.0000000000000036 It only knows the Atomic weight to 6 places. Asking it to display more is meaningless. However, use NumberForm to see more. NumberForm[elementatomicWkg = Convert[elementatomicW AMU, Kilogram], 20] Bob Hanlon ---- ratullochjk2 at gmail.com wrote: > Accessing and using built-in constants in Mathematica 6 / precision > tia sal2 > > Greetings all > > Sorry if this is a repeat post my last post didn't show up in the > newsgroups > > I can access the constants for the elements with no problem > Example: > In[1]:= ElementData["C", "AtomicWeight"] > Out[2]:= 12.0107 > > 1) I'm trying to use the built in constants for > speed of light, Plank's constant, etc.. but I'm having problems > finding them / the proper syntax. > > 2) Also How do I increase the amount of the decimal places? > Example: > elementatomicW := ElementData["C", "AtomicWeight"] > << Units` > Convert[elementatomicW AMU, Kilogram] > The answer is 1.99443*10^-26 Kilogram > > I add N like it says but the answer still comes out the same > Example: > << Units` > N[Convert[elementatomicW AMU, Kilogram], 20] > > tia sal2 >