एक प्रयोग में यह पाया गया कि किसी पदार्थ का आयतन प्रत्यास्थता गुणांक (bulk modulus of elasticity) उसके अपरूपण गुणांक (shear modulus) के बराबर है। पदार्थ का पॉइसन अनुपात (Poisson's ratio) क्या है?

When a bar of length l and uniform cross-section is rigidly fixed at the upper end and hangs freely, the total elongation produced in the bar due to its own weight is given by (where w = weight per unit volume and E = Modulus of Elasticity):

The hoop stress set up in a thin cylinder subjected to internal fluid pressure is: