Calc Middle-Earth Roleplaying - Sulhelka's Uttercold

Celebringbor's sword Sulhelka (Icy Wind) can call upon the Utter Cold, who's one of three major powers is to freeze over 10,000 cubic feet of ice (or 283.1685m^3). Water weighs 1000kg/m^3.

M = 283.1685 X 100kg
= 28316.85kg (28316850)g

To find our temperature, we will use the average temperature of water in the British Isles.

Overall, the average sea temperature in the British Isles ranges from 6-10 °C in the winter to 15-20 °C in the summer depending on region and yearly weather changes. By sea temperature we mean surface temperature relevant to a typical swimmer and the deeper you go the colder it will be.

Click to expand...

6 + 10 + 15 + 20 = 51/4 = 12.75°C

The specific heat of water is 4182 J/kg°C.

E = 28316.85 X 4182 X 12.75
= 1.5098686e9 kilojoules (1509868600000 joules)

We can also add the heat fusion of water (that being 333J/g).

E = 28316850 X 333
= 9429511050 joules

Finally, to add both together for our final yield.

E = 1509868600000 + 9429511050
= 1519298111050 joules
= 363.1209634440727 tons of TNT

Final Results
Sulhelka's Uttercold = 363.121 tons of TNT