[etoys-dev] Re: Need more decimal places (more than 10)

USeITWes etoys-dev-forum at squeakland.org
Thu Jul 16 17:48:21 EDT 2009

I was in hurry with the post above, so I kept it brief.  I apologize for being unclear, but now I can elaborate. The member in question is using the read out from a pH probe that gives a measurement which is alway between 0 (acid) and 14 (base) which gives 7 digits of precision.  He then tried to create a script to calculate the concentration of hydrogen ions [H+].  The formula to calculate that is 10^-pH = [H+]. For a substance that is extremely basic, say a 12.6 on the pH scale, that would result in a concentration of 0.000000000000251. He attempted to use that result in another script and another equation and received a divide-by-zero exception.

I hope that clears up any confusion. Thanks for the prompt response Mr. Cherlin.  I will try your solution immediately.

Wesley Williams
Project Assistant
USeIT Project

-------------------- m2f --------------------

(from forum)

-------------------- m2f --------------------

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://luna.immuexa.com/pipermail/etoys-dev/attachments/20090716/e295a19f/attachment-0001.html

More information about the etoys-dev mailing list