I-International System of Units (SI) iwuhlelo olusetshenziswa kakhulu lwamayunithi ukukala amanani abonakalayo. I-SI isetshenziswa emazweni amaningi omhlaba futhi cishe njalo kwisayensi.
Ithebula elingezansi linikeza ulwazi ngamayunithi angu-7 ayisisekelo e-SI: igama negama ( nesiNgisi/International), kanye nenani elilinganisiwe.
| Igama leyunithi | aphoyintimenti | Inani elilinganisiwe | ||
| Engl. | Engl. | |||
| Okwesibili | Okwesibili | с | s | Isikhathi |
| Meter | imitha | м | m | Ubude (noma ibanga) |
| Amakhilogremu | Amakhilogremu | kg | kg | Isisindo |
| I-Ampere | I-Ampere | А | A | Amandla kagesi wamanje |
| Kelvin | Kelvin | К | K | Ukushisa kwe-Thermodynamic |
| UMole | imvukuzane | imvukuzane | imvukuzane | Inani lezinto |
| Candela | Amakhandlela | cd | cd | Amandla okukhanya |
Qaphela: Ngisho noma izwe lisebenzisa isistimu ehlukile, ama-coefficients athile asethelwe izakhi zawo, okuwavumela ukuthi aguqulelwe kumayunithi we-SI.