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crispy
Joined: 09 Jun 2007
Posts: 1
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 Posted: June 9, 2007 6:49 AM Post subject: Physical chemestry, units and cm^-1 |
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Seems like the TI-89 doesnt know the relation between wavenumber (cm^-1) and its value in joules (which is 1 cm^-1 = 1.98*10^-23 J)
Is there any workaround for this problem?
This means that it also doesnt know this relation Å^3 = C*m^2/V...
Pretty annoying tbh 
I can of course do all the unit conversions myself, but it get abit tedious ni the long run.
Thanks in advance
- Crispy |
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mellamokb
Joined: 10 May 2007
Posts: 100
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| Posted: June 14, 2007 3:48 PM Post subject: |
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Hi crispy,
Welcome to TI-89 forums!
You have two options in this case. You can either define a function that describes the relationships between the two variables, or you can construct a new unit.
To define a function (on the home screen):
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Define wavenum(joules)=1.98*10^-23*joules _cm^-1
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To construct a new unit (on the home screen):
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1.98*10^-23_J => _wn
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where => is store and _wn stands for wave number (because you can't override the builtin units, so you have to construct your own with a new name). The benefit of constructing a new unit based on other units is that you can then use your new unit for conversions between any two units for which their relationship is defined in the calculator. This can be more powerful than a simple function if you have many units.
Please reply with any questions / concerns / comments you may have if necessary. I have not tested any of the code above on my calculator, so it may take some tweaking.
Hope this helps!
~ mellamokb |
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