1. Plural of pycnometer; instruments used to measure the density or specific gravity of liquids or solids by determining their volume and mass.
Usage: technical; scientific; also called specific gravity bottles or density bottles

Examples

• The laboratory technician calibrated the pycnometers before measuring the density of the unknown liquid.
• Pycnometers are essential tools in chemistry for determining the precise density of various substances.
• The student used pycnometers to compare the specific gravities of different oil samples.
• Accurate pycnometers must be cleaned thoroughly to prevent contamination between measurements.
• The physics experiment required several pycnometers of different sizes to test various materials.