1. The problem statement, all variables and given/known data To derive a formula to find the angle of twist when a torque T is applied and the temperature gradient is ΔT 2. Relevant equations 3. The attempt at a solution Angle of twist Φ=TL/JG I believe as temperature decreases, torque will increase which means angle of twist is inversely proportional to temperature. Thermal strain is α.ΔT.. Should I relate torque and strain so I will be able to get T and ΔT in my equation?