An overflow can is a type of laboratory apparatus used for measuring the volume of irregularly shaped objects, such as rocks or small animal specimens. It consists of a graduated cylinder with a spout at the top and a container with a spout at the bottom. To use an overflow can, the object to be measured is placed in the container and enough water is added to completely cover the object. As water is added, it overflows into the graduated cylinder, allowing the user to read the volume of the object by subtracting the initial volume of water in the cylinder from the final volume. Overflow cans are commonly used in geology, biology, and other scientific fields for measuring the volume of irregularly shaped objects. They are often preferred over other types of measuring tools for such applications because of their accuracy and precision. Overflow cans are available in a variety of sizes and materials, including glass and plastic. They may also be equipped with a lid to prevent splashing and contamination of the sample. Overall, an overflow can is an essential tool for any laboratory or educational setting where accurate measurement of irregularly shaped objects is required. It provides a simple and effective way to measure volume with precision and reproducibility.