CoachThe boiling point of a stuff is the temperature at which it boils. For water it is . Each stuff again has its own — which is why a careful cook can boil water away while the oil in the same pan stays quietly liquid.
Examples
Example 21.3 (Reading the world with two numbers)
Why is a chocolate bar solid on the shelf () but liquid in your pocket on a summer hike ()? Because its melting point, near , sits between the two. A stuff is solid below its melting point, liquid above it — up until its boiling point, where it leaves as gas. Two numbers tell the whole story of any stuff at any temperature.