összenyomhatóság

Compressibility, known in Hungarian as összenyomhatóság, is a measure of how much the volume of a given amount of matter changes when subjected to pressure. It is a fundamental property of fluids, both liquids and gases, and also applies to solids, though generally to a much lesser extent. High compressibility means that a substance's volume can be significantly reduced by applying external pressure.

The reciprocal of compressibility is bulk modulus, which represents a substance's resistance to uniform compression. A substance with high bulk modulus is difficult to compress, while a substance with low bulk modulus is easily compressed. Gases are highly compressible because their molecules are far apart and move freely, allowing them to occupy a smaller volume under pressure. Liquids are generally considered to be nearly incompressible, meaning their volume changes very little with pressure variations. Solids are also very difficult to compress due to the strong intermolecular forces holding their particles in fixed positions.

Compressibility is an important factor in many scientific and engineering applications, including the design of hydraulic systems, the behavior of gases in engines, and the study of planetary atmospheres. Understanding compressibility helps predict how materials will behave under different pressure conditions.