Volumetric flask

A volumetric flask is a thin-neck, pear-shaped, flat-bottomed container with a mouth and a marking line on the neck, which indicates that when the corrugated concave liquid is tangent to the marking line on the neck of the volumetric flask at the specified temperature, the volume of the solution is exactly the same as the volume of the bottle. The volumes marked above are equal. The volumetric flask is marked with: temperature, capacity, and scale. A measuring bottle is a precise instrument used to prepare a solution with an accurate amount and concentration of a certain substance.