Rigid bodies are characterized by: elasticity, ductility and fragility.
Elasticity – the property of the body to return to its original position after the cessation of the action of physical force from the outside. Examples include rubber.
Plasticity – a property that consists in fixing the acquired form after stopping or cessation of external exposure. This property does not restore its shape. Examples: clay, clay.
Fragility – the property of the body to collapse under small deformations. Examples: glass, porcelain.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.