Windchill supports over 40 standard quantities of measure in attribute definitions. Each quantity of measure has a syntactically valid set of units. Some quantities of measure, such as energy and torque, may be expressed in the same units but have different connotations to the user.

A quantity of measure is defined according to its measurement system. For example, acceleration is a quantity of measure that is a function of the base measures length and time. So, in the International System of Units (SI) measurement system, acceleration is expressed as m /s**2 (meters divided by seconds squared), while in the U.S. Customary (USCS) measurement system, it is expressed as in/s**2 (inches divided by seconds squared).

To access the Manage Quantities of Measure window, click Manage Quantities of Measure in the navigation pane on the left of the Type and Attribute Management utility.

From the Manage Quantities of Measure window, you can define your own quantities of measure and override existing display units. For example, in the MKS measurement system, force is expressed as kg*m /s**2, but you can override this setting and use Newtons (N) or Pound_Force (lbf) instead. To override the base measures for a specific quantity of measure, use the Supported Units Strings help topic to derive system-compatible units.