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December 23, 2004, 12:06 |
My god! 1 cal = ?? J
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#1 |
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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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December 23, 2004, 13:21 |
Re: My god! 1 cal = ?? J
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#2 |
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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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December 23, 2004, 13:30 |
Re: My god! 1 cal = ?? J
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#3 |
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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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December 23, 2004, 14:30 |
Re: My god! 1 cal = ?? J
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#4 |
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Interesting to note, I must say.
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January 17, 2005, 14:45 |
Re: My god! 1 cal = ?? J
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#5 |
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Thanks for the info.
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