Pycnometer

A pycnometer is a precise device used to measure the volume or density of a liquid or solid. It typically looks like a small tube with a narrow neck and a tightly fitted stopper. To use it, a sample or liquid is added, and the device is weighed or its volume is determined by filling it to a marked level. It is especially useful in laboratories for calculating the density of materials, such as soil, liquids, or powders. The pycnometer provides accurate, repeatable measurements by allowing the user to compare weights and volumes precisely.