If it is 0 degrees Celsius today, and twice as cold tomorrow, what temperature would it be?

Question

If it is 0 degrees Celsius today, and twice as cold tomorrow, what temperature would it be?

Answer 1

136.575 K  or -136.575 C

Wait, that's half the temperature.  Maybe that's not what you mean.  

If we define twice as cold as "emitting half the blackbody radiation," then the temperature that is twice as cold as 0 C (273.15 K) would be the one where:

P(T/2) = 0.5 * s * 273.15^4

or the emitted radiation is half what would be emitted by an object at 273.15 K according to the Stefan-Boltzmann law.  From the above relation, you can find that:

T(twice as cold) = (0.5*(273.15)^4)^0.25

That temperature comes out to be 229.7 K.

But it depends on what you mean by "twice as cold."

Answer 2

How about this.  If yesterday was 10 degrees, and it's 0 today.  Then twice as cold tomorrow would be -10 degrees.

http://www.stuffintheair.com/metric-conv...

Want that in Fahrenheit?  Try this conversion formula.