Which will sag less under its own weight plus a relatively light load, steel tube or solid rod? Say, 3/4' dia., 48' long, horizontal, supported at the ends, tube is 0.063' wall.
Load Tables For Unistrut P1000 & P1001 | Unistrut Service Co.
Deflection of hollow rectangular beams - Beam Deflection Calculator
Tubing Comparison - examples
Aluminum Tubing - Allowable Pressure
Weight supported by square steel tubing - Metal Shop - Dallas Makerspace Talk
Square Tube Deflection Calculator - EngineerExcel
Calculator For Rectangular Hollow Structural Sections | How to calculate the weight of hollow rectangular steel pipes? -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS