The $\mathrm{convert}\left(u\,\mathrm{unit\_name}\right)$ function returns a representation of the unit part of the expression $u$ that can be easily manipulated programmatically.

First this procedure determines the unit of $u$. Then every unit name or symbol in this unit expression is replaced by the function call $\mathrm{Units}:-\mathrm{UnitName}\left(\mathrm{string\; form\; of\; the\; full\; unit\; name}\right)$. The unit-free factor, if present, is ignored.

If there are annotations, then the base unit name (including its context, if applicable) is converted to a string; the resulting string is applied, as a function call, to the string form of the annotations.

The recommended way to convert units to a particular system or otherwise control the format of units is to do this before calling $\mathrm{convert}\left(\mathrm{...}\,\mathrm{unit\_name}\right)$, using commands such as $\mathrm{combine}$ and $\mathrm{convert}$.

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.

$\mathrm{convert}\left(45\sin \left(x\right)\mathrm{Unit}\left(\mathrm{farad}\right)\,'\mathrm{unit\_name}'\right)$

$\mathrm{Units}:-\mathrm{UnitName}\left(''farad''\right)$

$\mathrm{convert}\left(2\mathrm{Unit}\left(\mathrm{uF}\right)\,'\mathrm{unit\_name}'\right)$

$\mathrm{Units}:-\mathrm{UnitName}\left(''microfarad''\right)$

$\mathrm{convert}\left(2\mathrm{Unit}\left(\mathrm{mile}\left[\mathrm{nautical}\right]\left(\mathrm{radius}\right)\right)\,'\mathrm{unit\_name}'\right)$

$\mathrm{Units}:-\mathrm{UnitName}\left(''mile[nautical]''\left(''radius''\right)\right)$

$a≔\frac{5.8\mathrm{Unit}\left(\mathrm{pound}\right)\mathrm{Unit}\left(\mathrm{ft}\right)}{{\mathrm{Unit}\left(s\right)}^2}$

$a≔\frac{5.8}{{⟦s⟧}^2}⟦\mathrm{lb}⟧⟦\mathrm{ft}⟧$

$\mathrm{convert}\left(a\,'\mathrm{unit\_name}'\right)$

$\frac{\mathrm{Units}:-\mathrm{UnitName}\left(''pound''\right)\mathrm{Units}:-\mathrm{UnitName}\left(''foot''\right)}{{\mathrm{Units}:-\mathrm{UnitName}\left(''second''\right)}^2}$

$\mathrm{a1}≔\mathrm{combine}\left(a\,'\mathrm{units}'\right)$

$\mathrm{a1}≔0.8018787354⟦N⟧$

$\mathrm{convert}\left(\mathrm{a1}\,'\mathrm{unit\_name}'\right)$

$\mathrm{Units}:-\mathrm{UnitName}\left(''newton''\right)$

$\mathrm{a2}≔\mathrm{convert}\left(a\,'\mathrm{system}'\,'\mathrm{base}'\right)$

$\mathrm{a2}≔0.8018787354⟦\frac{\mathrm{kg}m}{s^2}⟧$

$\mathrm{convert}\left(\mathrm{a2}\,'\mathrm{unit\_name}'\right)$

$\frac{\mathrm{Units}:-\mathrm{UnitName}\left(''kilogram''\right)\mathrm{Units}:-\mathrm{UnitName}\left(''meter''\right)}{{\mathrm{Units}:-\mathrm{UnitName}\left(''second''\right)}^2}$

The convert/unit_name command was introduced in Maple 17.

For more information on Maple 17 changes, see Updates in Maple 17.