Does this mean Hell *CAN* Freeze over?

Sword-Tip to Laudator via Father Z:

H. Allen Smith, "The Achievement of H.T. Wensel," in Clifton Fadiman, ed., The Mathematical Magpie (New York: Simon and Schuster, 1962), pp. 141-142 (at 142):

The exact temperature of hell cannot be computed, but it must be less than 444.6° C., the temperature at which brimstone or sulphur changes from a liquid to a gas. Revelations [sic] 21:8: "But the fearful, and unbelieving ... shall have their part in the lake which burneth with fire and brimstone." A lake of molten brimstone means that its temperature must be below the boiling point, which is 444.6° C. If it were above this point it would be a vapor and not a lake.

As the article points out, hell (below 445° C. = 833° F.) is actually cooler than heaven (525° C. = 977° F., computed from Isaiah 30:26).

My world is upside down. Also... I am no Math wizard, so I have no idea how he got 977 F from this:

And the light of the moon shall be as the light of the sun, and the light of the sun shall be sevenfold, as the light of seven days: in the day when the Lord shall bind up the wound of his people, and shall heal the stroke of their wound.

I am guessing he multiplied something by 7? But when you divide 977 by 7, you get 139.6. Maybe the math is slightly different in Celsius. Because the hottest recorded temp I found was 136.