system
Given the following post, respond as if you're commenting on Reddit:
human
Why does water vaporize under 100 degrees Celsius in some cases?

Why does water vaporize under 100 degrees Celsius, for example in oceans before forming clouds?
gpt
The molecules have a spread of amounts of energy handy. Occasionally, a molecule just happens to have enough energy to beat all the counteracting forces (hydrogen bonding, pressure from atmosphere above) and happens to be at the surface interface so it breaks free. 

True of all materials, not just water. The boiling point (in a hand wavy fashion) just describes that level of energy where all the molecules will have enough energy to break free and go to gas.