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My god! 1 cal = ?? J

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Old   December 23, 2004, 13:06
Default My god! 1 cal = ?? J
  #1
ma
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In the famous Thermodynamics book of Moran and SHapiro,

1 cal = 4.1868 J

Searched google:

1 cal = 4.1868 J (1860 times) 1 cal = 4.184 J (9780 times)

Which one is more accurate??

I was so surprised that there are discrepency in such a very classical and standard unit factor.

Thanks.

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Old   December 23, 2004, 14:21
Default Re: My god! 1 cal = ?? J
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cfd dude
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The issue comes from what is the definition of a "calorie".

1 cal = 4.184 J is for a "thermochemical" calorie, the definition used in the U.S.

1 cal = 4.1868 J is the calories as defined by ISO.

There are other units that have multiple definitions (pounds troy vs. pounds avoirdupois, e.g.).

Source: Engineering Unit Conversions, by M.R. Lindenburg.
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Old   December 23, 2004, 14:30
Default Re: My god! 1 cal = ?? J
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cfd dude
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If you're that concerned, perhaps stick with the ISO definition (4.1868 J).

Or just do everything in SI units to start with....
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Old   December 23, 2004, 15:30
Default Re: My god! 1 cal = ?? J
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noName
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Interesting to note, I must say.
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Old   January 17, 2005, 15:45
Default Re: My god! 1 cal = ?? J
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ma
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Thanks for the info.
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