A Florence flask (also known as a boiling flask) is a type of flask used as an item of laboratory glassware. It can be used as a container to hold chemicals. A Florence flask has a round body with a single long neck and with either a round or a flat bottom. A Florence flask with a flat bottom may stand upright alone on a flat surface; flasks with round bottoms need support to stand upright. It is designed for uniform heating and ease of swirling; it is produced in a number of different glass thicknesses to stand different types of use. They are often made of borosilicate glass coated with alkali to prevent cracks or defacing of the glass. The flask is named after Florence, Italy. "Traditional" Florence flasks typically do not have a ground glass joint on their rather longer necks but typically have a slight lip or "flange" around the tip of the neck. A rather common size for a Florence flask is a volume of 1 liter.

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A similar variety of flasks used more commonly by professional chemists are round-bottom flasks. Round-bottom flasks always have spherical bottoms and have one or more shorter necks at the top, which are usually slightly narrower than a neck on a 1 liter Florence flask. The necks on round-bottom flasks typically have a ground glass joint at the tip. Round-bottom flasks commonly come in a larger variety of sizes than Florence flasks.

Laboratory glassware | Wet chemistry

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