#weights and measures

• Aerometry — A branch of applied physics and metrology dealing with the study of methods, techniques, and instruments utilized for measuring the physical properties of air and other gases, especially their density, specific weight, pressure, and flow rate.
• Arshin ruler — An archaic or regional term designating a measuring instrument of the length of one arshin (approximately 65-75 cm), in the form of a wooden or metal ruler, historically used by merchants in the Romanian Principalities to measure cloth, textiles, or other piece goods. In an extended sense, it can also indicate the amount of material corresponding to this unit.