A volumetric flask is a piece of Laboratory Glassware, a type of Laboratory Flask, calibrated to contain a precise volume at a particular temperature. Volumetric flasks are used for precise dilutions and preparation of Standard Solutions. The flask's mouth is either furnished with a plastic snap/screw cap or fitted with a Joint to accommodate a PTFE or glass stopper. The neck of the volumetric flasks is elongated and narrow with an etched ring Graduation marking. The marking indicates the volume of liquid contained when filled up to that point. The marking is typically Calibrated "to contain" at 20 C and indicated correspondingly on a label. The flask's label also indicates the Nominal Volume, Tolerance, precision class, relevant manufacturing standard and the manufacturers logo. The volumetric flasks are of various sizes.
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