A volumetric flask is a piece of laboratory equipment commonly used in scientific experiments, especially in chemistry, biology, and analytical studies to measure and hold a precise volume of liquid. They are also often referred to as standard flask or measuring flasks.

It is a pear-shaped piece of instrument with a long, narrow neck and flat-bottomed. On the neck, there is a line etched, known as the calibration mark. his mark indicates the exact volume the flask can hold when filled to that level, making it an essential tool for preparing solutions with precise concentrations. When a liquid is filled up to this mark, it indicates that the volumetric flask contains an exact volume, such as 100 milliliters (mL), 250 mL, or 1 liter (L)..