If the To field is empty the expression in the Convert field will be converted to the base MKS units meter, kilogram, and seconds. Clicking on the Clear button will erase the text in the text field with the focus. A Parser is used to interpret the unit expression entered by the user. In addition to these operators, the parser will recognize all the units defined in the six choice boxes. There are a few errors that may arise when trying to convert units.
Syntax errors result when the parser is unable to interpret a given expression.
This may be the result of a misplace or incorrect operator. An error will also be generated if the two expressions do not have similar units. For example you can not convert a time to an area.