What is the primary use of a graduated cylinder in the laboratory?

The primary use of a graduated cylinder in the laboratory is to measure and contain liquids. Graduated cylinders are specifically designed with measurement markings along their sides, allowing for accurate volume readings of liquids. This precision is essential in scientific experiments and analyses where the exact volume of a liquid is critical for consistency and reproducibility of results.

While transferring small volumes of liquid can be done with a graduated cylinder, it is not its main function, as there are other tools, such as pipettes, specifically designed for that purpose. Holding solid samples does not align with the graduated cylinder's intended use, as it is optimized for liquids. Additionally, providing first aid is unrelated to the function of a graduated cylinder, as this task is usually reserved for first aid kits or medical equipment. Therefore, measuring and containing liquids is the most accurate characterization of the graduated cylinder's primary purpose.