Here's why:

* Standardization: The SI system provides a universal, consistent language for scientific communication, ensuring that measurements are understood and comparable across the globe.

* Decimal System: The metric system uses a base-10 system, making calculations and conversions simpler.

* Interoperability: It allows for seamless collaboration between scientists from different countries and disciplines.

* Scientific Accuracy: SI units are designed for precise and accurate measurements, crucial for scientific research.

While the US still uses the customary system (inches, pounds, etc.) in many everyday contexts, the scientific community overwhelmingly relies on the SI system.