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 smaller bottom. A volumetric flask has a tall, narrow neck with a stopper closing the opening at top. There is a line on the neck to show how much to fill the flask. Volumetric flasks are made in many sizes, from small to big. They are often used to make liquid solutions. The neck is so narrow to make measurements more exact when making a regent.