Notes:
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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 and then enter the unit.
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When you edit a unit, double brackets appear around it.
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If an input has only one unit, the output uses that unit. If an input has more than one unit, the output is automatically converted to the default unit in the current system of units. The default system of units in the Units package is SI. To change the default system of units, use the UseSystem command.
You can specify a unit for the differentiating variable in the Units:-Natural:-diff function. To do so, multiply the differentiating variable by the unit.
Although the Natural Units environment provides a natural method of using units, some inputs can be misinterpreted as units. For example, the name is the symbol for the fresnel, a unit of frequency. Therefore, is interpreted as the fresnel with the modifier or attachment . To avoid these problems, use the strict option with the UseSystem command. Then only units, including units with prefixes, from the default system of units are accepted in the natural notation. To include units that are not in the default system, use the Unit command.