Question

Which is colder, 0°C or 20°F?

Answer 1

20 degrees F because 0 degrees celcius is around 32 degrees F 

Answer 2

In order to compare the two temperatures, we need to convert 20°F into Celsius. The formula we need to use is:

$T(^{\circ}C)=\frac{5}{9}(T(^{\circ}F)-32)$

Substituting 20°F, we find

$T(^{\circ}C)=\frac{5}{9}(20^{\circ}F-32) =-6.7^{\circ}C$

And this is less than 0°C, so the answer is

20°F is colder than 0°C.