SI (Système International d'Unités)

The SI, or Système International d'Unités, is the global standard system for measuring physical quantities like length, mass, time, and temperature. It provides a consistent set of units, such as meters for distance, kilograms for mass, seconds for time, and degrees Celsius for temperature, ensuring clear communication and accuracy across science, industry, and everyday life. The SI is based on precise constants and definitions, allowing measurements to be reliably replicated worldwide. This system helps in comparing, calculating, and understanding the physical world with standardized, universally accepted units.