Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

May 5th, 2017, 08:24 PM   #11
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Quote:
 Originally Posted by Monox D. I-Fly So the "true" answer is -1 degrees Celsius?
In this case, truth is in the eye of the person who wrote the question.

Last edited by skipjack; May 6th, 2017 at 05:17 AM.

May 6th, 2017, 12:03 AM   #12
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Quote:
 Originally Posted by romsek in this case truth is in the eye of the person who wrote the question.
I've checked, and found new paradoxes:
Should we multiply that 273 in Kelvin and that 32 in Fahrenheit with 4?

 May 6th, 2017, 05:05 AM #13 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,327 Thanks: 2451 Math Focus: Mainly analysis and algebra Temperature is a measure of energy. A conceptually "correct" scale should equate the meaurement to the magnitude of the energy. Scales not having zero at 0 Kelvin don't do this.
 May 7th, 2017, 06:34 PM #14 Senior Member     Joined: Nov 2010 From: Indonesia Posts: 1,992 Thanks: 132 Math Focus: Trigonometry So, it's 803.45 degrees Celcius?
 May 7th, 2017, 09:33 PM #15 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,327 Thanks: 2451 Math Focus: Mainly analysis and algebra That's my opinion, yes.
 May 7th, 2017, 09:41 PM #16 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 12,753 Thanks: 860 Hey Mr.Fly, why don't you move here: How Hot is Mercury?
May 7th, 2017, 11:15 PM   #17
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Quote:
 Originally Posted by romsek the thing is you could make some other temperature scale, just as valid, with smaller increments. Then "4 times" as hot would result in a smaller absolute temperature difference. So the question isn't really meaningful.
You could, but you'd end up with the same answer but for that scale, using kelvin to calculate is correct because you have absolute zero and temperature is linear, all other temperature scales (unless you design log ones) will be some multiplication and offset from that. I don't think I've explained that very well, can someone help?

May 7th, 2017, 11:38 PM   #18
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Quote:
 Originally Posted by weirddave You could, but you'd end up with the same answer but for that scale, using kelvin to calculate is correct because you have absolute zero and temperature is linear, all other temperature scales (unless you design log ones) will be some multiplication and offset from that. I don't think I've explained that very well, can someone help?
assuming a scale that had 0 at 0 kelvin you wouldn't need to convert to kelvin to do the computation.

This is what Archie mentioned a few posts back.

 May 8th, 2017, 04:08 AM #19 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,821 Thanks: 1047 Math Focus: Elementary mathematics and beyond The temperatures are akin to vectors in the sense that -4 is a vector in the negative x direction with a magnitude of 4. With that, 4 times hotter than -4 is 12 degrees C.
 May 8th, 2017, 04:59 AM #20 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,327 Thanks: 2451 Math Focus: Mainly analysis and algebra So 100 times colder than $0^\circ C$ is $0^\circ C$? I don't buy it.

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