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“Solid” means that the atomic or molecular bonds prevail on all other forces (thermal, gravitational, etc.). “Liquid” means that gravity forces prevail. Natural reality never fits with either one such an abstraction. Therefore, it is customary to refer to “plastic” materials, or to “viscous” fluids. By this, we afford in keeping a “simple” scheme based on an arbitrary abstraction, and, at the same time, we can approximately fit observations by means of a few ad hoc corrections. “Elasticity” is a concept that derives from and applies to either an ideal “solid” or an ideal “liquid” body. An ideal “elastic” body is such that some potential “elastic” energy is transformed into “kinetic” energy and vice versa, while this entire process strictly implies no energy loss of any kind. The concept of “elasticity” is closely related to the concept of matter “incompressibility”, which is usually taken for granted, although it should deserve consideration being an additional key abstraction.

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Acoustic Emission (AE) for Monitoring Stress and Ageing in Materials, Including Either Manmade or Natural Structures, and Assessing Paroxysmal Phases Precursors