An Erlenmeyer flask, also known as a conical flask, is a type of laboratory flask with a flat bottom, cylindrical body, and narrow neck. A “wide neck” Erlenmeyer flask has a wider opening at the top of the neck compared to a standard Erlenmeyer flask, making it easier to add or remove materials and clean the flask.

This type of flask is commonly used in various chemical reactions, mixing, and heating applications. It is named after the German chemist Emil Erlenmeyer who first designed it in the 1860s.

The flask’s shape provides stability and allows for easy swirling of the contents, while the narrow neck helps to minimize spillage.