Why poisson's ratio has no unit ?

How young's modulus, bulk modulus and poisson's ratio are connected ?

Define poisson's ratio and mention the range of its theoretical values.

Define poisson's ratio.

Poisson's ratio is a _____.

Explain poisson's ratio. State it's limits.

If there is no change in the volume of a wire due to change in it's length on stretching , what would be the poisson's ratio of the material.

What are different moduli of elasticity. Derive mathematical relation between them. Define poisson's ratio and prove that the limit lies between -1 to 1/2.