It's part of the metric system vs. the imperial system.
The metric system is the most used measurement system in the world. Only three countries in the world don't use the metric system: the
United States, Liberia, and Myanmar. Every other country around the world uses the metric system.
Right now United States hasn't changed to metric officially because of time - money plus education.
https://opentextbc.ca/basickitchenan...f-measurement/