Question

what is the difference between simple rigidity and torsion rigidity​

Answer 1

Answer:

Torsional Rigidity : The Angle of Twist per unit length of the Shaft. In the field of solid mechanics, torsion is the twisting of an object due to an applied torque. Torsion is expressed in newtons per square metre (Pa) or pounds per square inch (psi).

Rigidity is the maximum resistance an object can offer before it deforms, in other words, it is the minimum force required to deform an object.