What is e boiling?

"E boiling" isn't a recognized term in common language or scientific contexts. It's possible you meant one of the following:

* Ebullition: This refers to the rapid vaporization of a liquid, often accompanied by the formation of bubbles. It's essentially the process of boiling.

* Boiling point: This is the temperature at which a liquid's vapor pressure equals the surrounding atmospheric pressure, causing it to boil.

* Ebullioscopic constant: This is a physical property of a solvent that describes how much the boiling point of the solvent will increase when a non-volatile solute is added.

If you could provide more context or an example of where you encountered the term "e boiling," I might be able to give you a more specific answer.