A volumetric flask has a round or pear-shaped body with a long narrow neck and a flat bottom so it can stand upright. The neck is marked with a single calibration line, indicating the exact volume it is designed to hold (such as 100 ml, 250 ml, etc.). It is usually made of high-quality borosilicate glass to withstand temperature changes and chemical reactions. The flask comes with a tight-fitting stopper to prevent evaporation or contamination. It is mainly used in chemistry labs for preparing standard solutions, dilutions, and accurate measurements of liquids.

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