Outside, she thought that there ought to be a word for it: the air temperature that was perfectly neither hot nor cold. One degree lower, and she might have felt a faint misgiving about not having brought a jacket. One degree higher, and a skim of sweat might have glistened at her hairline. But at this precise degree, she required neither wrap nor breeze. Were there a word for such a temperature, there would have to be a corollary for the particular ecstasy of greeting it - the heedlessness, the needlessness, the suspended lack of urgency, as if time could stop, or should. Usually temperature was a battle; only at this exact fulcrum was it an active delight.
In metric, one milliliter of water occupies one cubic centimeter, weighs one gram, and requires one calorie of energy to heat up by one degree centigrade—which is 1 percent of the difference between its freezing point and its boiling point. An amount of hydrogen weighing the same amount has exactly one mole of atoms in it. Whereas in the American system, the answer to ‘How much energy does it take to boil a room-temperature gallon of water?’ is ‘Go fuck yourself,’ because you can’t directly relate any of those quantities.