Sets the thermal expansion coefficient of the asset. 
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2013 
Syntax
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Parameters
- thermalExpCoeff
- Type: SystemDouble
Remarks
 The thermal expansion coefficient is one-dimensional for wood-based and isotropic materials. This method sets the x, y, and z components to the same value. The value is in inverse Kelvin (1/K).