## Section3.26Scientific Units

If you are writing about science or engineering, or even if you are not, there is extensive support for scientific units. So, for example, you could author a force in metric units as

<quantity>
<mag>20.7</mag>
<unit prefix="kilo" base="gram" />
<unit base="meter" />
<per  base="second" exp="2" />
</quantity>


This would be rendered as 20.7 kg·ms2. More in Section 4.30.