Why Is The "Police Watchdog...
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No best answer has yet been selected by matt76. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Hammer has hit the nail on the head, (pun intended), in that both �C and �F scales are arbitrary scales, and as such, the terms "twice as hot" or "half as cold" don't have any meaning. ie 10 �C is not 'twice as hot' as 5 �C.
The only correct way to approach this question is to use a scale based on absolute zero, (as per kempie, rojash, & squirrel's answers), and, since 'cold' is a lack of heat, not an entity in itself, make all references with respect to heat. (ie half as warm, twice as warm etc)