Units matter

Source - Reddit

There is a significant problem with this question.

It's similar to one that Steve Mould brought up in a video I previously posted on the blog.

To say that the temperature is tripled is incredibly vague. As I teach in the unit of gas laws, to discuss temperature tripling (or doubling or whatever) we have to consider things in their absolute temperature. 

Doubling a temperature in Celsius or Fahrenheit would just double the portion above an arbitrary zero (freezing water for Celsius or the freezing point of a water/ice/ammonium chloride solution for Fahrenheit). That wouldn't really double the thermal energy or the average kinetic energy of the object because there's a whole bunch of that below the arbitrary zero.

To actually double the thermal energy or average kinetic energy, you would have to double the absolute temperature, something measured in either Kelvin or Rankine scales.

So it looks like Duolingo doesn't understand that aspect of temperature.