Nyomásérzékeny

Nyomásérzékeny refers to a property of a substance or material that changes its physical state or characteristics when subjected to pressure. This phenomenon is most commonly associated with adhesives, where a nyomásérzékeny adhesive, or pressure-sensitive adhesive (PSA), forms a bond simply when light pressure is applied, without the need for activation by water, solvent, or heat. These adhesives are designed to permanently bond to surfaces with initial contact and application of pressure. Examples include common items like sticky notes, labels, and tapes. The tackiness, or stickiness, of a PSA is crucial for its function.

Beyond adhesives, the term can also describe materials that exhibit changes in electrical, optical, or other properties under pressure. For instance, certain semiconductors or crystals can become more conductive or change their light-emitting characteristics when compressed. These pressure-sensitive materials have applications in sensors for measuring force, pressure, or strain. The response of a nyomásérzékeny material to pressure is often reversible, meaning it returns to its original state when the pressure is removed, although in some cases, the change can be permanent. The specific mechanism behind nyomásérzékenység varies widely depending on the material.