If we are being really pedantic, the freezing and boiling part of first paragraph is only true under sea level atmospheric pressure, so technically, you can't really relate these quantities with the given information in the first paragraph either.
But I don't think that's the point this exerpt is trying to make.
Yeah but if you're boiling your pasta and you live a few thousand feet above sea level you're gonna want to give it a bit more time since water boils colder up here.
A calorie is not a metric unit but the joule is, 1 calorie is approximately 4.2 joule.
A gram of hydrogen does not exactly have 1 mole of particles. The historical definition for the mole was the count of atoms in 12 grams of the ¹²C carbon isotope, which is slightly different.
But this is clearly written from the perspective of someone who lives in a climate that used to be solidly below freezing all through the winter months in the northern hemisphere. Now snow seems like a distant memory from childhood.
21°C/70°F is a normal winter temperature where I'm from in the southern hemisphere 🥲
And right now it's summer... let's put it this way, lately it's been over 40°C/104°F for so many weeks in a row that, when temperatures dipped to 33°C/91°F, it felt cold... and to think it's only going to get worse going forward @_@