Here's why:
* Evaporation is a surface phenomenon where liquid molecules with enough kinetic energy escape the liquid's surface and enter the gas phase. This occurs at any temperature, but it's more pronounced at higher temperatures.
* Boiling is a bulk phenomenon where vaporization occurs throughout the liquid, not just at the surface. This happens at the boiling point of the liquid, where the vapor pressure equals the surrounding atmospheric pressure.
So, even though the liquid isn't boiling, molecules at its surface are constantly evaporating.
