![Round diagram showing the seven SI base units](http://static.sciencelearn.org.nz/images/images/000/004/059/full/MSL_ART_03_SI_base_units_7BASE_SI_units.jpeg?1674173033)
The International System of Units is the most widely used system of measurement. The SI base units were revised in 2019 so each is defined by a constant of nature.
Image reproduced with permission of the BIPM, which retains full internationally protected copyright.