a volumetric flask (vol flask for short) is a type of laboratory glassware. it is used to hold and measure accurate amounts of liquid. it is shaped like a florence flask, but has a flatter bottom. a volumetric flask has a tall, narrow neck with a stopper that can be used to close the opening at the top. there is a line on the neck to show how much to fill the flask. volumetric flasks are made in many sizes, from a few milliliters to liters. they are often used to make liquid solutions. the neck is narrow to make measurements more exact when making a solution.