Florence flask
A Florence flask has a round body, a long neck, and often a flat bottom.It is designed for uniform heating, boiling, distillation 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 for heat and chemical resistance.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.The common volume for a Florence flask is 1 litre.