SI units must be used by default. If unit other than SI is used, the variable name must indicate it.

mass = 10 - means 10 kg

mass_lbs = 25 - unit other than SI

Base SI Units

\(s\) - second, measures time

\(m\) - meter, measures length

\(kg\) - kilogram, measures mass (not weight!)

\(A\) - ampere, electric current

\(K\) - kelvin, thermodynamic temperature

Derived Units

\(J = W\cdot s\) - joule, measures electric energy. Alternative units: Wh, kWh

\(e = J/kg\) - joule per kilogram, measures mass specific energy. Alternative units Wh/kg

\(C = A\cdot s\) - coloumb, measures electric charge. Alternative units: mAh, Ah

\(rad/s\) - radian per second, measures angular velocity. Alternative units: rpm, rps, 1/s, Hz