Comments on: At what temp will an alcohol thermometer w/a F scale read the same # as a thermomemter w/a celsius scale? http://www.cookthermometers.com/at-what-temp-will-an-alcohol-thermometer-wa-f-scale-read-the-same-as-a-thermomemter-wa-celsius-scale.php Just another WordPress weblog Sat, 26 Jun 2010 08:10:27 +0000 hourly 1 http://wordpress.org/?v=3.0 By: devilsadvocate1728 http://www.cookthermometers.com/at-what-temp-will-an-alcohol-thermometer-wa-f-scale-read-the-same-as-a-thermomemter-wa-celsius-scale.php/comment-page-1#comment-145 devilsadvocate1728 Tue, 20 Jan 2009 20:04:30 +0000 http://www.cookthermometers.com/at-what-temp-will-an-alcohol-thermometer-wa-f-scale-read-the-same-as-a-thermomemter-wa-celsius-scale.php#comment-145 The conversion formula from deg C to deg F is F = 9/5C + 32. You are asking at what temperature the numerical reading in deg F is the same as that for deg C, that is, where F = C. It is then a matter of setting up the equation 9/5C + 32 = C and solving for C. The answer is the two scales will read the same number at -40 deg F or C. You will get the same result if you use the conversion from deg C to deg F, namely, 5/9(F - 32) = C and use the equation F = 5/9(F - 32) The conversion formula from deg C to deg F is
F = 9/5C + 32.
You are asking at what temperature the numerical reading in deg F is the same as that for deg C, that is, where F = C. It is then a matter of setting up the equation

9/5C + 32 = C

and solving for C. The answer is the two scales will read the same number at -40 deg F or C.

You will get the same result if you use the conversion from deg C to deg F, namely,
5/9(F – 32) = C
and use the equation
F = 5/9(F – 32)

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