What is a rolling boil?

A rolling boil is a vigorous boiling state of a liquid, typically water. Here's what's important to know:

• Definition: A rolling boil is characterized by large bubbles rising continuously and rapidly to the surface of the liquid, with significant steam being produced. The bubbles are so energetic that stirring the liquid doesn't stop the boiling.

• Temperature: For water at standard atmospheric pressure, a rolling boil occurs at 100°C (212°F). Note that the boiling point changes with altitude (lower at higher altitudes).

• Importance in Cooking: Many recipes specify a rolling boil because it indicates a certain level of heat and ensures that the food is cooking thoroughly and evenly. It's used for things like pasta , blanching vegetables, and making certain sauces.

• Distinction from Simmering: A rolling boil is much more energetic than a simmer. Simmering involves gentler bubbles that rise slowly to the surface, with little steam production. Simmering maintains a temperature just below boiling.