Lub International System of Units (SI) yog qhov kev siv ntau tshaj plaws ntawm cov chav nyob rau kev ntsuas lub cev kom muaj nuj nqis. SI yog siv nyob rau hauv ntau lub teb chaws ntawm lub ntiaj teb no thiab yuav luag ib txwm nyob rau hauv science.
Cov lus hauv qab no muab cov ntaub ntawv qhia txog 7 lub hauv paus SI units: lub npe thiab lub npe (thiab Askiv / Thoob Ntiaj Teb), nrog rau cov nqi ntsuas.
| Lub npe tsev | lub sij hawm | Ntsuas tus nqi | ||
| Engl. | Engl. | |||
| Ob txhais | Ob txhais | с | s | Lub sij hawm |
| meter | 'meter' | м | m | Length (los yog nrug) |
| kilogram | kilogram | kg | kg | Nyhav |
| ampere | ampere | А | A | Lub zog tam sim no |
| Kelvin | Kelvin | К | K | Thermodynamic ntsuas kub |
| Mole | ntxha | ntxha | mole | Cov khoom siv npaum li cas |
| Candela | Tswm ciab | cd | cd | Lub zog ntawm lub teeb |
Nco ntsoov: Txawm hais tias ib lub teb chaws siv cov txheej txheem sib txawv, qee qhov coefficients tau teeb tsa rau nws cov ntsiab lus, tso cai rau lawv hloov mus rau SI units.