Physics Builder Tools This chapter provides a description of the tools in the Physics Builder that you can use to create custom physics interfaces for specific applications. • Building Blocks • External Resources • Components • Properties • Physics and Multiphysics Interfaces • Features • User Inputs • Variables • Equations • Constraints • Device Systems • Operators and Functions • Definitions Library • Physics Areas • Selections • Extra Dimensions • Auxiliary Definitions • Mesh Defaults • Study and Solver Defaults • Result Defaults • Migration • Documentation • Elements