Volumetric Flasks

For a comprehensive selection, see Flasks.
A volumetric flask (measuring flask, graduated flask) is a laboratory tool calibrated to contain a precise volume at a particular temperature. Volumetric flasks are used for precise dilutions and preparation of standard solutions.
Volumetric flasks are designed to store a relatively great volume of liquid with great accuracy. They are pear-shaped, have a flat bottom and are made of glass or plastic. The flask′s mouth has either a plastic cap or fitted with a joint to accommodate a stopper. The neck of volumetric flasks is elongated and narrow with an etched ring graduation marking.
The marking on a volumetric flask indicates the volume of liquid contained when filled up to that point. The marking is typically calibrated at 20 °C and indicated correspondingly on a label. The flask′s label also indicates the nominal volume, tolerance, precision class and relevant manufacturing standard.