The following sketchup video tutorial will provide great insight into the usage of solid tools inside sketchup. Solid tools can be found under tool menu. Alternatively one can go to view menu and then tool palettes and click on solid tools. Various solid shapes will be visible. Right click on the shape and one can apply various features. Inside sketchup there are six solid tools like subtract, trim, split, intersect, union, outer shell. These solid tools only function on solid models.
In SketchUp, a solid belongs to 3d model (component or group) having a finite closed volume. There should not be any leaks inside a sketchup solid (missing faces or faces that do not congregate at an edge).
The users will be able to choose a component or group and verify whether the selection is solid or not through the Entity Info dialog box. If there exist a volume itemized, the selection is a SketchUp solid. If there is no volume itemized, the selection can’t be defined as a solid and probably there is a leak.