pyknometreillä

A pyknometreillä is a laboratory instrument used to determine the density of liquids with high precision. The name derives from the Greek words "pyknos" meaning dense and "metron" meaning measure. Typically, a pyknometreillä is a flask with a precisely calibrated volume. It has a ground glass stopper with a narrow capillary tube that extends through it, ensuring that any excess liquid is expelled accurately to the calibrated mark.

To use a pyknometreillä, it is first weighed empty. Then, it is filled with the liquid whose density is to be measured, ensuring no air bubbles are trapped. The stopper is inserted, and any excess liquid is forced out through the capillary. The filled pyknometreillä is then weighed again. The difference in weight between the filled and empty instrument, divided by the known volume of the pyknometreillä, gives the density of the liquid. Temperature control is crucial for accurate measurements, as liquid volumes change with temperature. Therefore, pyknometreillä are often used in a water bath maintained at a specific, constant temperature. They are essential tools in analytical chemistry, quality control, and research where precise density determinations are required.