The temperature where some of a liquid begins to enter the gaseous state is called the boiling point.

Here's why:

* Boiling is the process where a liquid changes into a gas throughout the entire volume of the liquid, not just at the surface.

* This happens when the vapor pressure of the liquid equals the surrounding atmospheric pressure.

It's important to note that:

* The boiling point of a substance is specific to that substance and varies with atmospheric pressure.

* At the boiling point, the liquid and gas phases coexist in equilibrium.

Let me know if you'd like more information on boiling points or related concepts!