Re: Accessing and using built-in constants in Mathematica 6 /
- To: mathgroup at smc.vnet.net
- Subject: [mg86543] Re: Accessing and using built-in constants in Mathematica 6 /
- From: Steven Siew <siewsk at bp.com>
- Date: Thu, 13 Mar 2008 04:34:23 -0500 (EST)
- References: <fr8b7s$h1f$1@smc.vnet.net>
On Mar 12, 9:28 pm, ratulloch... at gmail.com wrote: > 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 You can do it this way but please beware of what you are doing. In[1]:= <<Miscellaneous`PhysicalConstants` In[2]:= ProtonMass Out[2]= 1.67262*10^-27 Kilograms In[3]:= ProtonMass = SetPrecision[Miscellaneous`PhysicalConstants`ProtonMass,60] Out[3]= 1.672621579999999975006214735803659920782386288365173851541560107657893668141325`60.*10^-27 Kilogram Ha Ha Ha. Of course no one knows the proton mass to the 60th decimal places.