Volumetric flasks are precise laboratory glassware used to measure and prepare accurate volumes of liquid solutions. They have a flat bottom, a long neck, and a single calibration mark to indicate a specific volume. Volumetric flasks are typically used in chemistry and biology labs to prepare solutions of known concentration, as they offer high precision in measuring liquids. They come in various sizes, with the most common volumes ranging from 50 mL to several liters. The narrow neck ensures that the exact volume is reached by filling the flask to the calibration line, ensuring precise measurements for experiments.