What is the internationally agreed-upon system of measurement for mass, distance, and volume called?

The internationally agreed-upon system of measurement for mass, distance, and volume is known as the SI system, or the International System of Units. This system is a standardized way of quantifying physical quantities based on coherent definitions and is widely adopted around the world, facilitating scientific communication and ensuring consistency in measurements.

The SI system comprises units like the meter for distance, kilogram for mass, and liter for volume, allowing for seamless conversions and calculations across different scientific disciplines. Its establishment helps eliminate confusion that can arise from using various other measurement systems, such as the Imperial system or United States customary units, which may have different base units and conversion factors. This consistency is critical for scientific experimentation, reporting, and international collaboration.

In contrast, the Metric system is a broader term that includes SI but can also refer to older metric units outside the SI. Meanwhile, the Imperial system and United States customary units are specific measurement systems used primarily in the United States and a few other countries, which aren't standardized internationally. Thus, the SI system is the foundational measurement system recognized universally in scientific contexts.