In the Standard Units environment, the eval function is overloaded to evaluate an expression after removing the units, and then combine the result with the units.

For other properties, see the global function eval.

$\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Standard}\right]\right)\:$

To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select $\mathrm{unit}$ and then enter the unit.

When you edit a unit, double brackets appear around it.

$\mathrm{velocity}≔\mathrm{sqrt}\left(2\mathrm{Unit}\left('\mathrm{gn}'\right)\mathrm{height}\right)$

$\mathrm{velocity}≔\sqrt{2}\sqrt{\mathrm{height}}⟦\sqrt{\mathrm{gn}}⟧$

$\mathrm{eval}\left(\mathrm{velocity}\,\mathrm{height}=3\mathrm{Unit}\left('\mathrm{ft}'\right)\right)$

$\frac{\sqrt{2}\sqrt{3}\sqrt{381}\sqrt{196133}}{5000}⟦\frac{m}{s}⟧$

$\mathrm{evalf}\left(\right)$

$4.234902778⟦\frac{m}{s}⟧$

$\mathrm{eval}\left(\mathrm{velocity}\,\mathrm{height}=0.03\mathrm{Unit}\left('\mathrm{km}'\right)\right)$

$0.01732050808\sqrt{2}\sqrt{196133}\sqrt{5}⟦\frac{m}{s}⟧$

$\mathrm{evalf}\left(\right)$

$24.25693715⟦\frac{m}{s}⟧$