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ptc-50710351-Visitor
1-Visitor
April 22, 2013
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MathCAD Math is wrong?

  • April 22, 2013
  • 1 reply
  • 4160 views

So I'm trying to do some simple math and it's not agreeing with my calculations. I'm doing some simple multiplication and division and it's giving me a negative result. I'm wondering if the unit conversions aren't quite right? I'm attaching the file so if anyone can offer some input, I would appreciate it. I have two equations side by side that show what MathCAD is giving me and what the simple multiplication and division SHOULD give me.

Best answer by ValeryOchkov

or so

RF.png

1 reply

V
24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
April 22, 2013

FR.png

P
ptc-50710351-VisitorAuthor
1-Visitor
April 22, 2013

Thanks a ton! I'm still getting used to these units.

V
24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
April 23, 2013

I see in one NIST (National institute of standards and technology in Boulder - www.nist.gov) reference book so

R-F.png

I ask my friend - one of the authors of this book, why they are using the Rankine degree in the specific heat, but the degree Fahrenheit (equal to degree Rankine) in thermal conductivity.

The answer was - it's an American engineering tradition and we can not change it. We can change the U.S. Constitution rather than this tradition.

We can see the degree Celsius (equal to degree Kelvin) in thermal conductivity only in old Russian reference books.

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