Metrology is the scientific study of measurement . In practice, it is the system of rules, standards, and instruments used to ensure that measurements are accurate, consistent, and reliable—whether you're measuring the diameter of a microchip, the voltage of a battery, or the mass of a kilogram. Core Idea: "If you can't measure it, you can't improve it." — Lord Kelvin The Three Main Branches of Metrology Metrology is divided into three overlapping fields:
