Whether in research, development, or international trade, measurement values must be clear and comparable everywhere. That is exactly why the International System of Units (SI = Système international d’unités) exists. It ensures that a meter, a kilogram, or a second is defined identically all around the world.
The principles of the SI system form the foundation: stability, unambiguity, a decimal structure, efficient nomenclature, and coherence. These principles ensure that measurements remain globally understandable, consistent, and practical to use.
Since 2019, the seven SI base units have been defined using immutable constants of nature. This allows units to be reproduced independently of location or measuring instrument. It provides a stable foundation for precise measurements, reliable products, and the global exchange of technologies.
The continuous improvement of measurement accuracy and the underlying constants also enables ongoing technological progress. In this way, the system of units remains a cornerstone of innovation — today and in the future.
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