A flat-bottom flask, also known as a boiling flask, is a type of laboratory flask with a flat bottom and a narrow neck. It is designed for heating and boiling liquids, and its flat bottom provides a large surface area for efficient heat transfer. The narrow neck helps to minimize spillage and allows for easier control of the contents while heating.

Flat-bottom flasks are commonly used in distillation, boiling, and other heating applications that require a stable base. They are often used in combination with a condenser for distillation processes.

The flask’s flat bottom allows for easy heating on a hot plate or in an oven, while the narrow neck provides a secure grip for handling.