Original: An elastic modulus , or modulus of elasticity , is the mathematical description of an object or substance 's tendency to be deformed elastically ( i.e. , non-permanently ) when a force is applied to it .
Simplified: An elastic modulus , or modulus of elasticity , is the mathematical description of an object or substances tendency to be deformed elastically ( i.e. non-permanently ) when a force is applied to it .